diff --git a/doc/source/figure/ab_ring_sketch.svg b/doc/source/figure/ab_ring_sketch.svg
new file mode 100644
index 0000000000000000000000000000000000000000..0b2e94288c0eb404ff434ee596e5cbaf7230a032
--- /dev/null
+++ b/doc/source/figure/ab_ring_sketch.svg
@@ -0,0 +1,140 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="250"
+   height="205"
+   id="svg2"
+   sodipodi:version="0.32"
+   inkscape:version="0.47 r22583"
+   sodipodi:docname="tutorial2c_sketch.svg"
+   inkscape:output_extension="org.inkscape.output.svg.inkscape"
+   version="1.0">
+  <defs
+     id="defs4">
+    <inkscape:perspective
+       sodipodi:type="inkscape:persp3d"
+       inkscape:vp_x="0 : 526.18109 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_z="744.09448 : 526.18109 : 1"
+       inkscape:persp3d-origin="372.04724 : 350.78739 : 1"
+       id="perspective3026" />
+    <inkscape:perspective
+       id="perspective3635"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="2.5106232"
+     inkscape:cx="54.499548"
+     inkscape:cy="102.0132"
+     inkscape:document-units="mm"
+     inkscape:current-layer="layer1"
+     showgrid="true"
+     inkscape:object-nodes="true"
+     inkscape:grid-points="true"
+     gridtolerance="1.3"
+     objecttolerance="0.8"
+     gridanglex="8.4666669mm"
+     gridanglez="8.4666669mm"
+     grid_units="mm"
+     inkscape:window-width="1399"
+     inkscape:window-height="974"
+     inkscape:window-x="57"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
+     units="pt">
+    <inkscape:grid
+       id="GridFromPre046Settings"
+       type="xygrid"
+       originx="0px"
+       originy="0px"
+       spacingx="2mm"
+       spacingy="2mm"
+       color="#0000ff"
+       empcolor="#ff0400"
+       opacity="0.2"
+       empopacity="0.37647059"
+       empspacing="5"
+       units="mm"
+       visible="true"
+       enabled="true"
+       snapvisiblegridlinesonly="true" />
+  </sodipodi:namedview>
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(-114.19886,19.255464)">
+    <path
+       style="fill:none;stroke:#000000;stroke-width:2.91644573;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0"
+       d="m 292.43863,75.559443 c 0,29.083897 -23.60435,52.688207 -52.68822,52.688207 -29.08392,0 -52.68818,-23.60431 -52.68818,-52.688207 0,-29.083901 23.60426,-52.688202 52.68818,-52.688202 29.08391,0 52.68822,23.604301 52.68822,52.688202 z"
+       id="path37307" />
+    <g
+       id="g38103"
+       style="fill:none;stroke:#000000;stroke-width:0.625;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none"
+       transform="matrix(4.6663129,0,0,4.6663129,-1242.7479,-57.338034)">
+      <path
+         id="path38105"
+         style="fill:none;stroke:#000000;stroke-width:0.625;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none"
+         d="m 291.10885,24.772314 6.48497,0.02214 c 3.35206,-13.407233 11.42324,-16.3201141 20.32977,-16.3207844 8.90637,-6.702e-4 16.34147,2.3839234 19.96964,16.3207844 l 6.16611,0.03299 m -0.0331,6.854657 -6.1677,-0.03489 c -3.36971,13.202794 -11.16975,17.013197 -20.07612,17.012527 -8.90653,-6.7e-4 -16.67166,-3.363359 -20.32977,-17.012527 l -6.27014,-0.02403"
+         sodipodi:nodetypes="ccsccccscc" />
+    </g>
+    <path
+       sodipodi:type="arc"
+       style="opacity:0.95;fill:#ff0000;fill-opacity:1;stroke:none"
+       id="path3602"
+       sodipodi:cx="64.400978"
+       sodipodi:cy="74.404541"
+       sodipodi:rx="0.98904526"
+       sodipodi:ry="0.98904526"
+       d="m 65.390023,74.404541 c 0,0.546235 -0.44281,0.989045 -0.989045,0.989045 -0.546235,0 -0.989045,-0.44281 -0.989045,-0.989045 0,-0.546235 0.44281,-0.989045 0.989045,-0.989045 0.546235,0 0.989045,0.44281 0.989045,0.989045 z"
+       transform="matrix(4.6663129,0,0,4.6663129,-62.675572,-272.11353)" />
+    <path
+       style="fill:none;stroke:#ff0000;stroke-width:2.33315659;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:4.66631287, 2.33315643;stroke-dashoffset:0"
+       d="M 237.70766,74.685746 237.44391,183.60434"
+       id="path3604"
+       sodipodi:nodetypes="cc" />
+    <g
+       transform="matrix(1.2202792,0,0,-1.2202792,244.56422,79.414671)"
+       inkscape:label="phi"
+       id="g3637">
+      <g
+         transform="scale(0.1,0.1)"
+         id="g3639">
+        <path
+           id="path3641"
+           style="fill:#ff0000;fill-opacity:1;fill-rule:nonzero;stroke:none"
+           d="m 125.012,52.4102 c 55.929,4.3203 96,37.7695 96,74.1018 0,37.41 -41.153,70.136 -96,74.476 l 0,19.934 c 0,12.098 0,17.09 34.136,17.09 l 11.864,0 0,11 c -12.91,-1.071 -45.91,-1.071 -60.614,-1.071 -14.7066,0 -48.0582,0 -60.9683,1.071 l 0,-11 11.75,0 c 33.832,0 33.832,-4.633 33.832,-17.09 l 0,-19.934 C 40.2812,195.57 2.01172,162.48 2.01172,126.871 2.01172,89.8203 41.6992,57.8086 95.0117,52.4102 l 0,-20.1407 C 95.0117,20.0391 95.0117,15 61.1797,15 l -11.75,0 0,-11 c 12.9101,1.07031 45.9101,1.07031 60.6093,1.07031 14.711,0 48.063,0 60.973,-1.07031 l 0,11 -11.864,0 c -34.136,0 -34.136,4.6797 -34.136,17.2695 l 0,20.1407 z M 95,60 c -50.5781,6.8789 -56.9883,43.84 -56.9883,66.301 0,18.84 3.5586,59.418 56.9883,66.687 L 95,60 z m 30.012,132.988 C 174.871,187.219 185,154.059 185,126.672 185,105.051 179.57,66.4805 125.012,60" />
+      </g>
+    </g>
+  </g>
+</svg>
diff --git a/doc/source/figure/ab_ring_sketch2.svg b/doc/source/figure/ab_ring_sketch2.svg
new file mode 100644
index 0000000000000000000000000000000000000000..2bf7bf06d8887295d88941f5cad2bfcbb026c50b
--- /dev/null
+++ b/doc/source/figure/ab_ring_sketch2.svg
@@ -0,0 +1,319 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="800"
+   height="213"
+   id="svg2"
+   sodipodi:version="0.32"
+   inkscape:version="0.47 r22583"
+   sodipodi:docname="tutorial2c_sketch2.svg"
+   inkscape:output_extension="org.inkscape.output.svg.inkscape"
+   version="1.0">
+  <defs
+     id="defs4">
+    <marker
+       inkscape:stockid="Arrow2Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow2Mend"
+       style="overflow:visible">
+      <path
+         id="path3770"
+         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
+         d="M 8.7185878,4.0337352 -2.2072895,0.01601326 8.7185884,-4.0017078 c -1.7454984,2.3720609 -1.7354408,5.6174519 -6e-7,8.035443 z"
+         transform="scale(-0.6,-0.6)" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow1Send"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow1Send"
+       style="overflow:visible">
+      <path
+         id="path3758"
+         d="M 0,0 5,-5 -12.5,0 5,5 0,0 z"
+         style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt;marker-start:none"
+         transform="matrix(-0.2,0,0,-0.2,-1.2,0)" />
+    </marker>
+    <marker
+       inkscape:stockid="Arrow2Lend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow2Lend"
+       style="overflow:visible">
+      <path
+         id="path3764"
+         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
+         d="M 8.7185878,4.0337352 -2.2072895,0.01601326 8.7185884,-4.0017078 c -1.7454984,2.3720609 -1.7354408,5.6174519 -6e-7,8.035443 z"
+         transform="matrix(-1.1,0,0,-1.1,-1.1,0)" />
+    </marker>
+    <inkscape:perspective
+       sodipodi:type="inkscape:persp3d"
+       inkscape:vp_x="0 : 526.18109 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_z="744.09448 : 526.18109 : 1"
+       inkscape:persp3d-origin="372.04724 : 350.78739 : 1"
+       id="perspective3026" />
+    <inkscape:perspective
+       id="perspective3635"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <inkscape:perspective
+       id="perspective2871"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <inkscape:perspective
+       id="perspective3667"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <inkscape:perspective
+       id="perspective3701"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <inkscape:perspective
+       id="perspective3701-2"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <inkscape:perspective
+       id="perspective4576"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <marker
+       inkscape:stockid="Arrow2Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow2Mend-0"
+       style="overflow:visible">
+      <path
+         id="path3770-5"
+         style="font-size:12px;fill-rule:evenodd;stroke-width:0.625;stroke-linejoin:round"
+         d="M 8.7185878,4.0337352 -2.2072895,0.01601326 8.7185884,-4.0017078 c -1.7454984,2.3720609 -1.7354408,5.6174519 -6e-7,8.035443 z"
+         transform="scale(-0.6,-0.6)" />
+    </marker>
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="1.96"
+     inkscape:cx="391.07137"
+     inkscape:cy="106.28166"
+     inkscape:document-units="mm"
+     inkscape:current-layer="layer1"
+     showgrid="true"
+     inkscape:object-nodes="true"
+     inkscape:grid-points="true"
+     gridtolerance="1.3"
+     objecttolerance="0.8"
+     gridanglex="8.4666669mm"
+     gridanglez="8.4666669mm"
+     grid_units="mm"
+     inkscape:window-width="1680"
+     inkscape:window-height="960"
+     inkscape:window-x="0"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0" />
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title />
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(199.8724,26.246742)">
+    <rect
+       style="opacity:0.95;fill:#9c9c9c;fill-opacity:1;stroke:none"
+       id="rect3734"
+       width="20.276669"
+       height="41.462551"
+       x="-45.860664"
+       y="59.196667" />
+    <g
+       id="g3681"
+       transform="matrix(3.8946736,0,0,5.5523606,-554.05901,-371.33435)"
+       style="stroke:#c4c4c4;stroke-width:0.59557372;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none">
+      <path
+         sodipodi:nodetypes="cc"
+         id="path3657"
+         d="m 200.95336,77.53144 72.03134,0"
+         style="fill:none;stroke:#c4c4c4;stroke-width:0.59557372;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
+      <path
+         sodipodi:nodetypes="cc"
+         id="path3657-9"
+         d="m 200.87605,84.852566 72.03134,0"
+         style="fill:none;stroke:#c4c4c4;stroke-width:0.59557372;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:2.76955438;stroke-linecap:round;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;stroke-dashoffset:0"
+       d="m 406.39299,-24.861965 c -57.92207,0 -104.89686,46.974867 -104.89686,104.896874 0,57.922011 46.97479,104.896891 104.89686,104.896891 57.92192,0 104.89689,-46.97488 104.89689,-104.896891 0,-57.922007 -46.97486,-104.896874 -104.89689,-104.896874 z m 0,42.408802 c 34.52383,0 62.48808,27.964263 62.48808,62.488072 0,34.523811 -27.9643,62.661171 -62.48808,62.661171 -34.52381,0 -62.48806,-28.13736 -62.48806,-62.661171 0,-34.523809 27.96425,-62.488072 62.48806,-62.488072 z"
+       id="path37307" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:2.76955438;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none"
+       d="m 509.44175,59.196676 34.11393,0 39.97331,0"
+       id="path3657-8"
+       sodipodi:nodetypes="ccc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:2.76955438;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none"
+       d="m 509.36221,99.749189 74.08724,0"
+       id="path3657-9-0"
+       sodipodi:nodetypes="cc" />
+    <g
+       id="g3681-4"
+       transform="matrix(-4.9045266,0,0,5.5391089,1140.3731,-370.25841)"
+       style="stroke-width:0.53136313;stroke-miterlimit:4;stroke-dasharray:none">
+      <path
+         sodipodi:nodetypes="cc"
+         id="path3657-83"
+         d="m 200.95336,77.53144 72.03134,0"
+         style="fill:none;stroke:#000000;stroke-width:0.53136313;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
+      <path
+         sodipodi:nodetypes="cc"
+         id="path3657-9-9"
+         d="m 200.87605,84.852566 72.03134,0"
+         style="fill:none;stroke:#000000;stroke-width:0.53136313;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none" />
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:4.15433168;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow2Mend)"
+       d="m -33.937237,79.776421 56.83818,0"
+       id="path3738"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:4.15433168;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow2Mend)"
+       d="m 537.78747,79.080327 56.83819,0"
+       id="path3738-2"
+       sodipodi:nodetypes="cc" />
+    <g
+       style="font-size:3px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Times;-inkscape-font-specification:Times"
+       id="text4596"
+       transform="matrix(5.5391089,0,0,5.5391089,-908.40072,-363.2872)">
+      <path
+         d="m 151.33955,86.880928 0,-0.993164 0.26954,0 0,0.98291 c -1e-5,0.155274 0.0303,0.271973 0.0908,0.350098 0.0605,0.07715 0.15136,0.115723 0.27246,0.115722 0.1455,10e-7 0.26025,-0.04639 0.34423,-0.13916 0.085,-0.09277 0.12744,-0.219237 0.12745,-0.379394 l 0,-0.930176 0.26953,0 0,1.640625 -0.26953,0 0,-0.251953 c -0.0654,0.09961 -0.14161,0.173828 -0.22852,0.222656 -0.0859,0.04785 -0.18604,0.07178 -0.30029,0.07178 -0.18848,0 -0.33155,-0.05859 -0.4292,-0.175781 -0.0977,-0.117187 -0.14649,-0.288574 -0.14649,-0.51416"
+         id="path3652" />
+      <path
+         d="m 154.63545,86.538155 0,0.990234 -0.26953,0 0,-0.981445 c 0,-0.155273 -0.0303,-0.271483 -0.0908,-0.348633 -0.0606,-0.07715 -0.15137,-0.115721 -0.27246,-0.115723 -0.14551,2e-6 -0.26025,0.04639 -0.34424,0.13916 -0.084,0.09277 -0.12598,0.21924 -0.12598,0.379395 l 0,0.927246 -0.27099,0 0,-1.640625 0.27099,0 0,0.254883 c 0.0645,-0.09863 0.14014,-0.172362 0.22706,-0.221192 0.0879,-0.04883 0.18896,-0.07324 0.30322,-0.07324 0.18847,2e-6 0.33105,0.0586 0.42773,0.175781 0.0967,0.116213 0.14502,0.287599 0.14502,0.514161"
+         id="path3654" />
+      <path
+         d="m 155.17598,85.887764 0.26953,0 0,1.640625 -0.26953,0 0,-1.640625 m 0,-0.638672 0.26953,0 0,0.341309 -0.26953,0 0,-0.341309"
+         id="path3656" />
+      <path
+         d="m 156.27461,85.421944 0,0.46582 0.55518,0 0,0.209473 -0.55518,0 0,0.890625 c 0,0.133789 0.0181,0.219727 0.0542,0.257812 0.0371,0.03809 0.11182,0.05713 0.22412,0.05713 l 0.27686,0 0,0.225586 -0.27686,0 c -0.20801,0 -0.35156,-0.03857 -0.43066,-0.115723 -0.0791,-0.07812 -0.11865,-0.219726 -0.11865,-0.424804 l 0,-0.890625 -0.19776,0 0,-0.209473 0.19776,0 0,-0.46582 0.27099,0"
+         id="path3658" />
+      <path
+         d="m 159.32149,85.950752 0,0.251953 c -0.0762,-0.04199 -0.15284,-0.07324 -0.22998,-0.09375 -0.0762,-0.02148 -0.15332,-0.03222 -0.23145,-0.03223 -0.1748,10e-7 -0.31055,0.05567 -0.40722,0.166992 -0.0967,0.110353 -0.14502,0.265626 -0.14502,0.46582 0,0.200196 0.0483,0.355958 0.14502,0.467285 0.0967,0.110352 0.23242,0.165528 0.40722,0.165528 0.0781,0 0.15527,-0.01025 0.23145,-0.03076 0.0771,-0.02148 0.1538,-0.05322 0.22998,-0.09522 l 0,0.249024 c -0.0752,0.03516 -0.15332,0.06152 -0.23438,0.0791 -0.0801,0.01758 -0.16553,0.02637 -0.25635,0.02637 -0.24707,0 -0.44336,-0.07764 -0.58886,-0.23291 -0.14551,-0.155273 -0.21826,-0.364745 -0.21826,-0.628418 0,-0.267577 0.0732,-0.478026 0.21972,-0.631347 0.14746,-0.153319 0.34912,-0.229979 0.60498,-0.229981 0.083,2e-6 0.16406,0.0088 0.24317,0.02637 0.0791,0.0166 0.15576,0.04199 0.22998,0.07617"
+         id="path3660" />
+      <path
+         d="m 161.19063,86.640694 0,0.131836 -1.23926,0 c 0.0117,0.185547 0.0674,0.327148 0.16699,0.424804 0.10059,0.09668 0.24024,0.14502 0.41895,0.14502 0.10351,0 0.20361,-0.01269 0.30029,-0.03809 0.0977,-0.02539 0.19434,-0.06348 0.29004,-0.114258 l 0,0.254883 c -0.0967,0.04102 -0.1958,0.07227 -0.29736,0.09375 -0.10157,0.02148 -0.20459,0.03223 -0.30909,0.03223 -0.26172,0 -0.46923,-0.07617 -0.62255,-0.228515 -0.15235,-0.152344 -0.22852,-0.358398 -0.22852,-0.618164 0,-0.268554 0.0723,-0.481444 0.2168,-0.638672 0.1455,-0.158202 0.3413,-0.237303 0.5874,-0.237305 0.2207,2e-6 0.39502,0.07129 0.52295,0.213867 0.1289,0.141603 0.19336,0.334474 0.19336,0.578614 m -0.26953,-0.0791 c -0.002,-0.14746 -0.0435,-0.265135 -0.12451,-0.353027 -0.0801,-0.08789 -0.18653,-0.131835 -0.31934,-0.131836 -0.15039,1e-6 -0.271,0.04248 -0.36182,0.127441 -0.0898,0.08496 -0.1416,0.204591 -0.15527,0.358887 l 0.96094,-0.0015"
+         id="path3662" />
+      <path
+         d="m 161.62715,85.249092 0.26953,0 0,2.279297 -0.26953,0 0,-2.279297"
+         id="path3664" />
+      <path
+         d="m 162.45918,85.249092 0.26953,0 0,2.279297 -0.26953,0 0,-2.279297"
+         id="path3666" />
+    </g>
+    <g
+       style="font-size:3px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Times;-inkscape-font-specification:Times"
+       id="text4600"
+       transform="matrix(5.5391089,0,0,5.5391089,-908.40072,-363.2872)">
+      <path
+         d="m 170.44072,79.012825 0,0.46582 0.55518,0 0,0.209473 -0.55518,0 0,0.890625 c 0,0.133789 0.0181,0.219727 0.0542,0.257812 0.0371,0.03809 0.11181,0.05713 0.22412,0.05713 l 0.27686,0 0,0.225586 -0.27686,0 c -0.20801,0 -0.35156,-0.03857 -0.43066,-0.115722 -0.0791,-0.07813 -0.11866,-0.219727 -0.11866,-0.424805 l 0,-0.890625 -0.19775,0 0,-0.209473 0.19775,0 0,-0.46582 0.271,0"
+         id="path3669" />
+      <path
+         d="m 172.30254,79.730598 c -0.0303,-0.01758 -0.0635,-0.03027 -0.0996,-0.03808 -0.0352,-0.0088 -0.0742,-0.01318 -0.11719,-0.01318 -0.15235,10e-7 -0.26953,0.04981 -0.35156,0.149414 -0.0811,0.09863 -0.12159,0.240724 -0.12159,0.42627 l 0,0.864257 -0.27099,0 0,-1.640625 0.27099,0 0,0.254883 c 0.0566,-0.09961 0.13038,-0.173338 0.2212,-0.221191 0.0908,-0.04883 0.20117,-0.07324 0.33105,-0.07324 0.0186,1e-6 0.0391,0.0015 0.0615,0.0044 0.0225,0.002 0.0474,0.0054 0.0747,0.01025 l 0.001,0.276855"
+         id="path3671" />
+      <path
+         d="m 173.33379,80.294563 c -0.21778,10e-7 -0.36866,0.0249 -0.45264,0.07471 -0.084,0.04981 -0.12598,0.134767 -0.12598,0.254883 0,0.0957 0.0312,0.171875 0.0937,0.228516 0.0635,0.05566 0.14942,0.0835 0.25782,0.0835 0.14941,0 0.26904,-0.05273 0.35888,-0.158203 0.0908,-0.106445 0.13623,-0.247558 0.13623,-0.42334 l 0,-0.06006 -0.26806,0 m 0.53759,-0.111328 0,0.936035 -0.26953,0 0,-0.249023 c -0.0615,0.09961 -0.13818,0.17334 -0.22998,0.221191 -0.0918,0.04687 -0.2041,0.07031 -0.33691,0.07031 -0.16797,0 -0.30176,-0.04687 -0.40137,-0.140625 -0.0986,-0.09473 -0.14795,-0.221191 -0.14795,-0.379395 0,-0.184569 0.0615,-0.323729 0.18457,-0.41748 0.12402,-0.09375 0.30859,-0.140624 0.55371,-0.140625 l 0.37793,0 0,-0.02637 c 0,-0.124023 -0.041,-0.219726 -0.12304,-0.28711 -0.0811,-0.06836 -0.19532,-0.102537 -0.34278,-0.102539 -0.0937,2e-6 -0.18506,0.01123 -0.27392,0.03369 -0.0889,0.02246 -0.17432,0.05615 -0.25635,0.101074 l 0,-0.249024 c 0.0986,-0.03808 0.19433,-0.0664 0.28711,-0.08496 0.0928,-0.01953 0.1831,-0.02929 0.27099,-0.0293 0.23731,1e-6 0.41455,0.06153 0.53174,0.18457 0.11719,0.123048 0.17578,0.309571 0.17578,0.55957"
+         id="path3673" />
+      <path
+         d="m 175.79765,80.129036 0,0.990234 -0.26953,0 0,-0.981445 c 0,-0.155272 -0.0303,-0.271483 -0.0908,-0.348633 -0.0606,-0.07715 -0.15137,-0.115721 -0.27246,-0.115722 -0.14551,1e-6 -0.26025,0.04639 -0.34424,0.13916 -0.084,0.09277 -0.12597,0.219239 -0.12597,0.379394 l 0,0.927246 -0.271,0 0,-1.640625 0.271,0 0,0.254883 c 0.0645,-0.09863 0.14013,-0.172362 0.22705,-0.221191 0.0879,-0.04883 0.18896,-0.07324 0.30322,-0.07324 0.18847,10e-7 0.33105,0.0586 0.42773,0.175781 0.0967,0.116212 0.14502,0.287599 0.14502,0.51416"
+         id="path3675" />
+      <path
+         d="m 177.38408,79.526985 0,0.254883 c -0.0762,-0.03906 -0.15528,-0.06836 -0.23731,-0.08789 -0.082,-0.01953 -0.16699,-0.0293 -0.25488,-0.0293 -0.13379,2e-6 -0.23437,0.02051 -0.30176,0.06152 -0.0664,0.04102 -0.0996,0.10254 -0.0996,0.18457 0,0.0625 0.0239,0.111818 0.0718,0.147949 0.0479,0.03516 0.14404,0.06885 0.28858,0.101075 l 0.0923,0.02051 c 0.19141,0.04102 0.32715,0.09912 0.40723,0.174317 0.0811,0.07422 0.12158,0.178223 0.12158,0.312012 0,0.152344 -0.0606,0.272949 -0.18164,0.361816 -0.12012,0.08887 -0.28565,0.133301 -0.49658,0.133301 -0.0879,0 -0.17969,-0.0088 -0.27539,-0.02637 -0.0947,-0.0166 -0.19483,-0.04199 -0.3003,-0.07617 l 0,-0.278321 c 0.0996,0.05176 0.19776,0.09082 0.29444,0.117188 0.0967,0.02539 0.19238,0.03809 0.28711,0.03809 0.12695,0 0.2246,-0.02148 0.29297,-0.06445 0.0684,-0.04395 0.10253,-0.105469 0.10253,-0.184571 0,-0.07324 -0.0249,-0.129394 -0.0747,-0.168457 -0.0488,-0.03906 -0.15674,-0.07666 -0.32373,-0.112793 l -0.0937,-0.02197 c -0.167,-0.03516 -0.2876,-0.08887 -0.36182,-0.161133 -0.0742,-0.07324 -0.11133,-0.173339 -0.11133,-0.300293 0,-0.154296 0.0547,-0.273436 0.16406,-0.357422 0.10938,-0.08398 0.26465,-0.125975 0.46582,-0.125976 0.0996,10e-7 0.19336,0.0073 0.28125,0.02197 0.0879,0.01465 0.16895,0.03662 0.24317,0.06592"
+         id="path3677" />
+      <path
+         d="m 177.90263,78.839973 0.26953,0 0,2.279297 -0.26953,0 0,-2.279297"
+         id="path3679" />
+      <path
+         d="m 179.48027,80.294563 c -0.21777,10e-7 -0.36865,0.0249 -0.45264,0.07471 -0.084,0.04981 -0.12597,0.134767 -0.12597,0.254883 0,0.0957 0.0312,0.171875 0.0937,0.228516 0.0635,0.05566 0.14941,0.0835 0.25781,0.0835 0.14941,0 0.26904,-0.05273 0.35889,-0.158203 0.0908,-0.106445 0.13623,-0.247558 0.13623,-0.42334 l 0,-0.06006 -0.26807,0 m 0.5376,-0.111328 0,0.936035 -0.26953,0 0,-0.249023 c -0.0615,0.09961 -0.13819,0.17334 -0.22998,0.221191 -0.0918,0.04687 -0.20411,0.07031 -0.33692,0.07031 -0.16797,0 -0.30176,-0.04687 -0.40136,-0.140625 -0.0986,-0.09473 -0.14795,-0.221191 -0.14795,-0.379395 0,-0.184569 0.0615,-0.323729 0.18457,-0.41748 0.12402,-0.09375 0.30859,-0.140624 0.55371,-0.140625 l 0.37793,0 0,-0.02637 c 0,-0.124023 -0.041,-0.219726 -0.12305,-0.28711 -0.0811,-0.06836 -0.19531,-0.102537 -0.34277,-0.102539 -0.0937,2e-6 -0.18506,0.01123 -0.27393,0.03369 -0.0889,0.02246 -0.17432,0.05615 -0.25635,0.101074 l 0,-0.249024 c 0.0986,-0.03808 0.19434,-0.0664 0.28711,-0.08496 0.0928,-0.01953 0.18311,-0.02929 0.271,-0.0293 0.2373,1e-6 0.41455,0.06153 0.53174,0.18457 0.11718,0.123048 0.17578,0.309571 0.17578,0.55957"
+         id="path3681" />
+      <path
+         d="m 180.84697,79.012825 0,0.46582 0.55518,0 0,0.209473 -0.55518,0 0,0.890625 c 0,0.133789 0.0181,0.219727 0.0542,0.257812 0.0371,0.03809 0.11181,0.05713 0.22412,0.05713 l 0.27686,0 0,0.225586 -0.27686,0 c -0.20801,0 -0.35156,-0.03857 -0.43066,-0.115722 -0.0791,-0.07813 -0.11866,-0.219727 -0.11866,-0.424805 l 0,-0.890625 -0.19775,0 0,-0.209473 0.19775,0 0,-0.46582 0.271,0"
+         id="path3683" />
+      <path
+         d="m 181.7581,79.478645 0.26953,0 0,1.640625 -0.26953,0 0,-1.640625 m 0,-0.638672 0.26953,0 0,0.341309 -0.26953,0 0,-0.341309"
+         id="path3685" />
+      <path
+         d="m 183.22588,79.66761 c -0.14454,2e-6 -0.25879,0.05664 -0.34278,0.169922 -0.084,0.112306 -0.12597,0.266603 -0.12597,0.462891 0,0.196289 0.0415,0.351074 0.12451,0.464355 0.084,0.112305 0.19873,0.168457 0.34424,0.168457 0.14355,0 0.25732,-0.05664 0.3413,-0.169922 0.084,-0.11328 0.12598,-0.267577 0.12598,-0.46289 0,-0.194335 -0.042,-0.348144 -0.12598,-0.461426 -0.084,-0.114257 -0.19775,-0.171385 -0.3413,-0.171387 m 0,-0.228515 c 0.23437,1e-6 0.41845,0.07617 0.55224,0.228515 0.13379,0.152345 0.20068,0.363283 0.20069,0.632813 -1e-5,0.268555 -0.0669,0.479492 -0.20069,0.632812 -0.13379,0.152344 -0.31787,0.228516 -0.55224,0.228516 -0.23536,0 -0.41993,-0.07617 -0.55372,-0.228516 -0.13281,-0.15332 -0.19921,-0.364257 -0.19921,-0.632812 0,-0.26953 0.0664,-0.480468 0.19921,-0.632813 0.13379,-0.152342 0.31836,-0.228514 0.55372,-0.228515"
+         id="path3687" />
+      <path
+         d="m 185.78789,80.129036 0,0.990234 -0.26953,0 0,-0.981445 c -1e-5,-0.155272 -0.0303,-0.271483 -0.0908,-0.348633 -0.0606,-0.07715 -0.15137,-0.115721 -0.27246,-0.115722 -0.14551,1e-6 -0.26026,0.04639 -0.34424,0.13916 -0.084,0.09277 -0.12598,0.219239 -0.12598,0.379394 l 0,0.927246 -0.271,0 0,-1.640625 0.271,0 0,0.254883 c 0.0645,-0.09863 0.14014,-0.172362 0.22705,-0.221191 0.0879,-0.04883 0.18896,-0.07324 0.30322,-0.07324 0.18848,10e-7 0.33106,0.0586 0.42774,0.175781 0.0967,0.116212 0.14502,0.287599 0.14502,0.51416"
+         id="path3689" />
+      <path
+         d="m 187.07402,80.294563 c -0.21777,10e-7 -0.36865,0.0249 -0.45264,0.07471 -0.084,0.04981 -0.12597,0.134767 -0.12597,0.254883 0,0.0957 0.0312,0.171875 0.0937,0.228516 0.0635,0.05566 0.14941,0.0835 0.25781,0.0835 0.14941,0 0.26904,-0.05273 0.35889,-0.158203 0.0908,-0.106445 0.13623,-0.247558 0.13623,-0.42334 l 0,-0.06006 -0.26807,0 m 0.5376,-0.111328 0,0.936035 -0.26953,0 0,-0.249023 c -0.0615,0.09961 -0.13819,0.17334 -0.22998,0.221191 -0.0918,0.04687 -0.20411,0.07031 -0.33692,0.07031 -0.16797,0 -0.30176,-0.04687 -0.40136,-0.140625 -0.0986,-0.09473 -0.14795,-0.221191 -0.14795,-0.379395 0,-0.184569 0.0615,-0.323729 0.18457,-0.41748 0.12402,-0.09375 0.30859,-0.140624 0.55371,-0.140625 l 0.37793,0 0,-0.02637 c 0,-0.124023 -0.041,-0.219726 -0.12305,-0.28711 -0.0811,-0.06836 -0.19531,-0.102537 -0.34277,-0.102539 -0.0937,2e-6 -0.18506,0.01123 -0.27393,0.03369 -0.0889,0.02246 -0.17432,0.05615 -0.25635,0.101074 l 0,-0.249024 c 0.0986,-0.03808 0.19434,-0.0664 0.28711,-0.08496 0.0928,-0.01953 0.18311,-0.02929 0.271,-0.0293 0.2373,1e-6 0.41455,0.06153 0.53174,0.18457 0.11718,0.123048 0.17578,0.309571 0.17578,0.55957"
+         id="path3691" />
+      <path
+         d="m 188.17412,78.839973 0.26953,0 0,2.279297 -0.26953,0 0,-2.279297"
+         id="path3693" />
+      <path
+         d="m 189.76787,79.478645 0.28564,0 0.5127,1.376953 0.51269,-1.376953 0.28565,0 -0.61524,1.640625 -0.36621,0 -0.61523,-1.640625"
+         id="path3695" />
+      <path
+         d="m 193.13994,80.231575 0,0.131836 -1.23926,0 c 0.0117,0.185547 0.0674,0.327149 0.16699,0.424805 0.10059,0.09668 0.24024,0.145019 0.41895,0.145019 0.10351,0 0.20361,-0.01269 0.30029,-0.03809 0.0977,-0.02539 0.19434,-0.06348 0.29004,-0.114258 l 0,0.254883 c -0.0967,0.04102 -0.1958,0.07227 -0.29736,0.09375 -0.10157,0.02148 -0.20459,0.03223 -0.30909,0.03223 -0.26171,0 -0.46923,-0.07617 -0.62255,-0.228516 -0.15235,-0.152343 -0.22852,-0.358398 -0.22852,-0.618164 0,-0.268554 0.0723,-0.481444 0.2168,-0.638672 0.1455,-0.158201 0.34131,-0.237303 0.5874,-0.237304 0.2207,10e-7 0.39502,0.07129 0.52295,0.213867 0.1289,0.141603 0.19336,0.334474 0.19336,0.578613 m -0.26953,-0.0791 c -0.002,-0.147459 -0.0435,-0.265135 -0.12451,-0.353027 -0.0801,-0.08789 -0.18653,-0.131834 -0.31934,-0.131836 -0.15039,2e-6 -0.271,0.04248 -0.36182,0.127442 -0.0898,0.08496 -0.1416,0.204591 -0.15527,0.358886 l 0.96094,-0.0015"
+         id="path3697" />
+      <path
+         d="m 194.75713,79.541634 0,0.251953 c -0.0762,-0.04199 -0.15284,-0.07324 -0.22998,-0.09375 -0.0762,-0.02148 -0.15333,-0.03222 -0.23145,-0.03223 -0.17481,2e-6 -0.31055,0.05567 -0.40723,0.166992 -0.0967,0.110353 -0.14502,0.265626 -0.14502,0.465821 0,0.200196 0.0483,0.355957 0.14502,0.467285 0.0967,0.110352 0.23242,0.165527 0.40723,0.165527 0.0781,0 0.15527,-0.01025 0.23145,-0.03076 0.0771,-0.02148 0.1538,-0.05322 0.22998,-0.09521 l 0,0.249023 c -0.0752,0.03516 -0.15333,0.06152 -0.23438,0.0791 -0.0801,0.01758 -0.16553,0.02637 -0.25635,0.02637 -0.24707,0 -0.44336,-0.07764 -0.58886,-0.23291 -0.14551,-0.155273 -0.21827,-0.364746 -0.21827,-0.628418 0,-0.267577 0.0733,-0.478026 0.21973,-0.631348 0.14746,-0.153319 0.34912,-0.229979 0.60498,-0.22998 0.083,10e-7 0.16406,0.0088 0.24317,0.02637 0.0791,0.0166 0.15576,0.04199 0.22998,0.07617"
+         id="path3699" />
+      <path
+         d="m 195.48955,79.012825 0,0.46582 0.55517,0 0,0.209473 -0.55517,0 0,0.890625 c 0,0.133789 0.0181,0.219727 0.0542,0.257812 0.0371,0.03809 0.11181,0.05713 0.22412,0.05713 l 0.27685,0 0,0.225586 -0.27685,0 c -0.20801,0 -0.35156,-0.03857 -0.43067,-0.115722 -0.0791,-0.07813 -0.11865,-0.219727 -0.11865,-0.424805 l 0,-0.890625 -0.19775,0 0,-0.209473 0.19775,0 0,-0.46582 0.271,0"
+         id="path3701" />
+      <path
+         d="m 197.03642,79.66761 c -0.14453,2e-6 -0.25879,0.05664 -0.34277,0.169922 -0.084,0.112306 -0.12598,0.266603 -0.12598,0.462891 0,0.196289 0.0415,0.351074 0.12451,0.464355 0.084,0.112305 0.19873,0.168457 0.34424,0.168457 0.14356,0 0.25733,-0.05664 0.34131,-0.169922 0.084,-0.11328 0.12598,-0.267577 0.12598,-0.46289 0,-0.194335 -0.042,-0.348144 -0.12598,-0.461426 -0.084,-0.114257 -0.19775,-0.171385 -0.34131,-0.171387 m 0,-0.228515 c 0.23438,1e-6 0.41846,0.07617 0.55225,0.228515 0.13379,0.152345 0.20068,0.363283 0.20068,0.632813 0,0.268555 -0.0669,0.479492 -0.20068,0.632812 -0.13379,0.152344 -0.31787,0.228516 -0.55225,0.228516 -0.23535,0 -0.41992,-0.07617 -0.55371,-0.228516 -0.13281,-0.15332 -0.19922,-0.364257 -0.19922,-0.632812 0,-0.26953 0.0664,-0.480468 0.19922,-0.632813 0.13379,-0.152342 0.31836,-0.228514 0.55371,-0.228515"
+         id="path3703" />
+      <path
+         d="m 199.18535,79.730598 c -0.0303,-0.01758 -0.0635,-0.03027 -0.0996,-0.03808 -0.0352,-0.0088 -0.0742,-0.01318 -0.11719,-0.01318 -0.15234,10e-7 -0.26953,0.04981 -0.35156,0.149414 -0.0811,0.09863 -0.12158,0.240724 -0.12158,0.42627 l 0,0.864257 -0.271,0 0,-1.640625 0.271,0 0,0.254883 c 0.0566,-0.09961 0.13037,-0.173338 0.22119,-0.221191 0.0908,-0.04883 0.20117,-0.07324 0.33105,-0.07324 0.0186,1e-6 0.0391,0.0015 0.0615,0.0044 0.0225,0.002 0.0474,0.0054 0.0747,0.01025 l 10e-4,0.276855"
+         id="path3705" />
+    </g>
+  </g>
+</svg>
diff --git a/doc/source/figure/superconductor_transport_sketch.svg b/doc/source/figure/superconductor_transport_sketch.svg
new file mode 100644
index 0000000000000000000000000000000000000000..35f087cd2bc17e04258920aeae4173f36d135ae4
--- /dev/null
+++ b/doc/source/figure/superconductor_transport_sketch.svg
@@ -0,0 +1,325 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<!-- Created with Inkscape (http://www.inkscape.org/) -->
+
+<svg
+   xmlns:dc="http://purl.org/dc/elements/1.1/"
+   xmlns:cc="http://creativecommons.org/ns#"
+   xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
+   xmlns:svg="http://www.w3.org/2000/svg"
+   xmlns="http://www.w3.org/2000/svg"
+   xmlns:sodipodi="http://sodipodi.sourceforge.net/DTD/sodipodi-0.dtd"
+   xmlns:inkscape="http://www.inkscape.org/namespaces/inkscape"
+   width="236.85225"
+   height="102.88937"
+   id="svg2"
+   sodipodi:version="0.32"
+   inkscape:version="0.47 r22583"
+   sodipodi:docname="tutorial5b_sketch.svg"
+   inkscape:output_extension="org.inkscape.output.svg.inkscape"
+   version="1.0">
+  <defs
+     id="defs4">
+    <marker
+       inkscape:stockid="Arrow1Mend"
+       orient="auto"
+       refY="0"
+       refX="0"
+       id="Arrow1Mend"
+       style="overflow:visible">
+      <path
+         id="path5182"
+         d="M 0,0 5,-5 -12.5,0 5,5 0,0 z"
+         style="fill-rule:evenodd;stroke:#000000;stroke-width:1pt;marker-start:none"
+         transform="matrix(-0.4,0,0,-0.4,-4,0)" />
+    </marker>
+    <pattern
+       inkscape:stockid="Stripes 1:2"
+       id="Strips1_2"
+       patternTransform="matrix(0.93049189,-0.87551382,1.8365019,1.9518254,0,0)"
+       height="1"
+       width="3"
+       patternUnits="userSpaceOnUse"
+       inkscape:collect="always">
+      <rect
+         id="rect4444"
+         height="2"
+         width="1"
+         y="-0.5"
+         x="0"
+         style="fill:black;stroke:none" />
+    </pattern>
+    <inkscape:perspective
+       sodipodi:type="inkscape:persp3d"
+       inkscape:vp_x="0 : 526.18109 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_z="744.09448 : 526.18109 : 1"
+       inkscape:persp3d-origin="372.04724 : 350.78739 : 1"
+       id="perspective3026" />
+    <inkscape:perspective
+       id="perspective3635"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+    <inkscape:perspective
+       id="perspective3695"
+       inkscape:persp3d-origin="0.5 : 0.33333333 : 1"
+       inkscape:vp_z="1 : 0.5 : 1"
+       inkscape:vp_y="0 : 1000 : 0"
+       inkscape:vp_x="0 : 0.5 : 1"
+       sodipodi:type="inkscape:persp3d" />
+  </defs>
+  <sodipodi:namedview
+     id="base"
+     pagecolor="#ffffff"
+     bordercolor="#666666"
+     borderopacity="1.0"
+     inkscape:pageopacity="0.0"
+     inkscape:pageshadow="2"
+     inkscape:zoom="2.5106232"
+     inkscape:cx="34.418931"
+     inkscape:cy="46.021777"
+     inkscape:document-units="mm"
+     inkscape:current-layer="layer1"
+     showgrid="true"
+     inkscape:object-nodes="true"
+     inkscape:grid-points="true"
+     gridtolerance="1.3"
+     objecttolerance="0.8"
+     gridanglex="8.4666669mm"
+     gridanglez="8.4666669mm"
+     grid_units="mm"
+     inkscape:window-width="1399"
+     inkscape:window-height="974"
+     inkscape:window-x="57"
+     inkscape:window-y="0"
+     inkscape:window-maximized="0"
+     units="pt"
+     inkscape:snap-bbox="true">
+    <inkscape:grid
+       id="GridFromPre046Settings"
+       type="xygrid"
+       originx="0px"
+       originy="0px"
+       spacingx="2mm"
+       spacingy="2mm"
+       color="#0000ff"
+       empcolor="#ff0400"
+       opacity="0.2"
+       empopacity="0.37647059"
+       empspacing="5"
+       units="mm"
+       visible="true"
+       enabled="true"
+       snapvisiblegridlinesonly="true" />
+  </sodipodi:namedview>
+  <metadata
+     id="metadata7">
+    <rdf:RDF>
+      <cc:Work
+         rdf:about="">
+        <dc:format>image/svg+xml</dc:format>
+        <dc:type
+           rdf:resource="http://purl.org/dc/dcmitype/StillImage" />
+        <dc:title></dc:title>
+      </cc:Work>
+    </rdf:RDF>
+  </metadata>
+  <g
+     inkscape:label="Ebene 1"
+     inkscape:groupmode="layer"
+     id="layer1"
+     transform="translate(-127.3091,-26.863735)">
+    <rect
+       style="opacity:0.95;fill:#858585;fill-opacity:1;stroke:none"
+       id="rect2911"
+       width="113.38583"
+       height="56.692913"
+       x="248.84453"
+       y="44.012253" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:2.12598419;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none"
+       d="m 248.0315,63.267717 -233.858272,0"
+       id="path3685"
+       transform="translate(114.19886,-19.255464)"
+       sodipodi:nodetypes="cc" />
+    <path
+       style="fill:none;stroke:#000000;stroke-width:2.12598419;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none"
+       d="m 363.09835,100.70517 -233.85827,0"
+       id="path3685-7"
+       sodipodi:nodetypes="cc" />
+    <rect
+       style="opacity:0.95;fill:url(#Strips1_2);fill-opacity:1;stroke:none"
+       id="rect3709"
+       width="15.135684"
+       height="55.763046"
+       x="220.49808"
+       y="44.012253" />
+    <g
+       style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Times;-inkscape-font-specification:Times"
+       id="text5156">
+      <path
+         d="m 133.86818,32.019985 0,3.960938 -1.07813,0 0,-3.925782 c 0,-0.621089 -0.12109,-1.085932 -0.36328,-1.394531 -0.24219,-0.308588 -0.60547,-0.462885 -1.08984,-0.46289 -0.58204,5e-6 -1.04102,0.185552 -1.37695,0.55664 -0.33594,0.371099 -0.50391,0.876958 -0.50391,1.517578 l 0,3.708985 -1.08398,0 0,-6.5625 1.08398,0 0,1.019531 c 0.25781,-0.394525 0.56054,-0.689447 0.9082,-0.884766 0.35156,-0.195306 0.75586,-0.292962 1.21289,-0.292968 0.7539,6e-6 1.32422,0.234381 1.71094,0.703125 0.38671,0.464849 0.58007,1.150395 0.58008,2.05664"
+         style=""
+         id="path5623" />
+      <path
+         d="m 138.57326,30.174282 c -0.57813,6e-6 -1.03516,0.226568 -1.3711,0.679688 -0.33594,0.449223 -0.5039,1.06641 -0.5039,1.851562 0,0.785159 0.16601,1.404299 0.49804,1.857422 0.33594,0.44922 0.79492,0.673829 1.37696,0.673828 0.57421,1e-6 1.02929,-0.226561 1.36523,-0.679687 0.33593,-0.453124 0.5039,-1.07031 0.50391,-1.851563 -1e-5,-0.77734 -0.16798,-1.392573 -0.50391,-1.845703 -0.33594,-0.457026 -0.79102,-0.685541 -1.36523,-0.685547 m 0,-0.914062 c 0.93749,6e-6 1.67382,0.304693 2.20898,0.914062 0.53515,0.60938 0.80273,1.453129 0.80274,2.53125 -1e-5,1.074221 -0.26759,1.91797 -0.80274,2.53125 -0.53516,0.609375 -1.27149,0.914062 -2.20898,0.914063 -0.94141,-10e-7 -1.67969,-0.304688 -2.21485,-0.914063 -0.53125,-0.61328 -0.79687,-1.457029 -0.79687,-2.53125 0,-1.078121 0.26562,-1.92187 0.79687,-2.53125 0.53516,-0.609369 1.27344,-0.914056 2.21485,-0.914062"
+         style=""
+         id="path5625" />
+      <path
+         d="m 147.16896,30.426235 c -0.1211,-0.07031 -0.25391,-0.121088 -0.39844,-0.152344 -0.14063,-0.03515 -0.29688,-0.05273 -0.46875,-0.05273 -0.60938,6e-6 -1.07812,0.199224 -1.40625,0.597656 -0.32422,0.394536 -0.48633,0.962895 -0.48633,1.705078 l 0,3.457032 -1.08398,0 0,-6.5625 1.08398,0 0,1.019531 c 0.22657,-0.398432 0.52149,-0.693353 0.88477,-0.884766 0.36328,-0.195306 0.80468,-0.292962 1.32422,-0.292968 0.0742,6e-6 0.15624,0.0059 0.24609,0.01758 0.0898,0.0078 0.18945,0.02149 0.29883,0.04101 l 0.006,1.107422"
+         style=""
+         id="path5627" />
+      <path
+         d="m 153.20998,30.678188 c 0.26952,-0.484369 0.59179,-0.84179 0.96679,-1.072265 0.375,-0.230462 0.8164,-0.345697 1.32422,-0.345703 0.68359,6e-6 1.21093,0.24024 1.58203,0.720703 0.37109,0.476568 0.55663,1.156255 0.55664,2.039062 l 0,3.960938 -1.08398,0 0,-3.925782 c -1e-5,-0.628901 -0.11134,-1.095698 -0.33399,-1.40039 -0.22266,-0.304682 -0.5625,-0.457026 -1.01953,-0.457031 -0.5586,5e-6 -1,0.185552 -1.32422,0.55664 -0.32422,0.371099 -0.48633,0.876958 -0.48632,1.517578 l 0,3.708985 -1.08399,0 0,-3.925782 c 0,-0.632807 -0.11133,-1.099604 -0.33398,-1.40039 -0.22266,-0.304682 -0.56641,-0.457026 -1.03125,-0.457031 -0.55079,5e-6 -0.98829,0.187505 -1.3125,0.5625 -0.32422,0.371098 -0.48633,0.875004 -0.48633,1.511718 l 0,3.708985 -1.08398,0 0,-6.5625 1.08398,0 0,1.019531 c 0.24609,-0.402338 0.54101,-0.699213 0.88477,-0.890625 0.34374,-0.1914 0.75194,-0.287103 1.2246,-0.287109 0.47656,6e-6 0.88086,0.1211 1.2129,0.363281 0.33593,0.242193 0.58397,0.593756 0.74414,1.054687"
+         style=""
+         id="path5629" />
+      <path
+         d="m 162.7549,32.682095 c -0.8711,3e-6 -1.47461,0.09961 -1.81055,0.298828 -0.33594,0.199221 -0.50391,0.539065 -0.50391,1.019531 0,0.382814 0.125,0.687501 0.375,0.914062 0.25391,0.222658 0.59766,0.333986 1.03125,0.333985 0.59766,1e-6 1.07617,-0.210937 1.43555,-0.632813 0.36328,-0.425779 0.54492,-0.990232 0.54492,-1.693359 l 0,-0.240234 -1.07226,0 m 2.15039,-0.445313 0,3.744141 -1.07813,0 0,-0.996094 c -0.24609,0.398438 -0.55274,0.69336 -0.91992,0.884766 -0.36719,0.187499 -0.81641,0.281249 -1.34765,0.28125 -0.67188,-10e-7 -1.20704,-0.1875 -1.60547,-0.5625 -0.39454,-0.378906 -0.5918,-0.884765 -0.5918,-1.517579 0,-0.738278 0.24609,-1.294918 0.73828,-1.669921 0.49609,-0.374996 1.23437,-0.562496 2.21484,-0.5625 l 1.51172,0 0,-0.105469 c 0,-0.496089 -0.16406,-0.878901 -0.49218,-1.148438 -0.32423,-0.273432 -0.78126,-0.41015 -1.3711,-0.410156 -0.375,6e-6 -0.74023,0.04493 -1.0957,0.134766 -0.35547,0.08985 -0.69727,0.224615 -1.02539,0.404297 l 0,-0.996094 c 0.39453,-0.152338 0.77734,-0.265619 1.14844,-0.339844 0.37109,-0.07812 0.73241,-0.117181 1.08398,-0.117187 0.94921,6e-6 1.6582,0.2461 2.12695,0.738281 0.46875,0.492193 0.70312,1.238286 0.70313,2.238281"
+         style=""
+         id="path5631" />
+      <path
+         d="m 167.15529,26.863735 1.07812,0 0,9.117188 -1.07812,0 0,-9.117188"
+         style=""
+         id="path5633" />
+      <path
+         d="m 174.30373,26.863735 1.07812,0 0,9.117188 -1.07812,0 0,-9.117188"
+         style=""
+         id="path5635" />
+      <path
+         d="m 183.24513,32.430141 0,0.527344 -4.95703,0 c 0.0469,0.74219 0.26953,1.308596 0.66797,1.699219 0.40234,0.38672 0.96093,0.580079 1.67578,0.580078 0.41406,1e-6 0.81445,-0.05078 1.20117,-0.152344 0.39062,-0.101561 0.77734,-0.253905 1.16016,-0.457031 l 0,1.019531 c -0.38673,0.164063 -0.78321,0.289063 -1.18945,0.375 -0.40626,0.08594 -0.81837,0.128906 -1.23633,0.128907 -1.04688,-10e-7 -1.87696,-0.304688 -2.49024,-0.914063 -0.60937,-0.609374 -0.91406,-1.433591 -0.91406,-2.472656 0,-1.074215 0.28906,-1.925776 0.86719,-2.554688 0.58203,-0.632806 1.36523,-0.949212 2.34961,-0.949218 0.88281,6e-6 1.58007,0.285162 2.09179,0.855468 0.51562,0.566412 0.77344,1.337895 0.77344,2.314453 m -1.07812,-0.316406 c -0.008,-0.589839 -0.17384,-1.060542 -0.49805,-1.412109 -0.32032,-0.351557 -0.7461,-0.527338 -1.27734,-0.527344 -0.60157,6e-6 -1.08399,0.169928 -1.44727,0.509766 -0.35938,0.339848 -0.56641,0.818364 -0.62109,1.435547 l 3.84375,-0.0059"
+         style=""
+         id="path5637" />
+      <path
+         d="m 187.97365,32.682095 c -0.8711,3e-6 -1.47461,0.09961 -1.81055,0.298828 -0.33594,0.199221 -0.50391,0.539065 -0.50391,1.019531 0,0.382814 0.125,0.687501 0.375,0.914062 0.25391,0.222658 0.59766,0.333986 1.03125,0.333985 0.59766,1e-6 1.07617,-0.210937 1.43555,-0.632813 0.36328,-0.425779 0.54492,-0.990232 0.54492,-1.693359 l 0,-0.240234 -1.07226,0 m 2.15039,-0.445313 0,3.744141 -1.07813,0 0,-0.996094 c -0.24609,0.398438 -0.55274,0.69336 -0.91992,0.884766 -0.36719,0.187499 -0.81641,0.281249 -1.34765,0.28125 -0.67188,-10e-7 -1.20704,-0.1875 -1.60547,-0.5625 -0.39454,-0.378906 -0.5918,-0.884765 -0.5918,-1.517579 0,-0.738278 0.24609,-1.294918 0.73828,-1.669921 0.49609,-0.374996 1.23437,-0.562496 2.21484,-0.5625 l 1.51172,0 0,-0.105469 c 0,-0.496089 -0.16406,-0.878901 -0.49218,-1.148438 -0.32423,-0.273432 -0.78126,-0.41015 -1.3711,-0.410156 -0.375,6e-6 -0.74023,0.04493 -1.0957,0.134766 -0.35547,0.08985 -0.69727,0.224615 -1.02539,0.404297 l 0,-0.996094 c 0.39453,-0.152338 0.77734,-0.265619 1.14844,-0.339844 0.37109,-0.07812 0.73241,-0.117181 1.08398,-0.117187 0.94921,6e-6 1.6582,0.2461 2.12695,0.738281 0.46875,0.492193 0.70312,1.238286 0.70313,2.238281"
+         style=""
+         id="path5639" />
+      <path
+         d="m 196.6924,30.414516 0,-3.550781 1.07812,0 0,9.117188 -1.07812,0 0,-0.984375 c -0.22657,0.390625 -0.51368,0.681641 -0.86133,0.873047 -0.34375,0.187499 -0.75782,0.281249 -1.24219,0.28125 -0.79297,-10e-7 -1.43945,-0.316407 -1.93945,-0.949219 -0.4961,-0.632811 -0.74414,-1.464842 -0.74414,-2.496094 0,-1.031246 0.24804,-1.863276 0.74414,-2.496094 0.5,-0.632806 1.14648,-0.949212 1.93945,-0.949218 0.48437,6e-6 0.89844,0.09571 1.24219,0.287109 0.34765,0.187506 0.63476,0.476568 0.86133,0.867187 m -3.67383,2.291016 c 0,0.792971 0.16211,1.416018 0.48633,1.869141 0.32812,0.449219 0.77734,0.673829 1.34765,0.673828 0.57031,1e-6 1.01953,-0.224609 1.34766,-0.673828 0.32812,-0.453123 0.49218,-1.07617 0.49219,-1.869141 -1e-5,-0.792965 -0.16407,-1.414058 -0.49219,-1.863281 -0.32813,-0.45312 -0.77735,-0.679682 -1.34766,-0.679688 -0.57031,6e-6 -1.01953,0.226568 -1.34765,0.679688 -0.32422,0.449223 -0.48633,1.070316 -0.48633,1.863281"
+         style=""
+         id="path5641" />
+    </g>
+    <g
+       style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Times;-inkscape-font-specification:Times"
+       id="text5160">
+      <path
+         d="m 272.46338,30.556499 0,1.019532 c -0.30469,-0.156245 -0.6211,-0.273432 -0.94922,-0.351563 -0.32813,-0.07812 -0.66797,-0.117181 -1.01953,-0.117187 -0.53516,6e-6 -0.9375,0.08204 -1.20703,0.246093 -0.26563,0.164068 -0.39844,0.410162 -0.39844,0.738282 0,0.250004 0.0957,0.44727 0.28711,0.591797 0.1914,0.140629 0.57617,0.275394 1.1543,0.404296 l 0.36914,0.08203 c 0.76562,0.164066 1.30859,0.396487 1.6289,0.697265 0.32422,0.296878 0.48633,0.712893 0.48633,1.248047 0,0.609376 -0.24219,1.091798 -0.72656,1.447266 -0.48047,0.355469 -1.14258,0.533203 -1.98633,0.533203 -0.35156,0 -0.71875,-0.03516 -1.10156,-0.105469 -0.37891,-0.06641 -0.7793,-0.167968 -1.20117,-0.304687 l 0,-1.113282 c 0.39843,0.207033 0.79101,0.363283 1.17773,0.46875 0.38672,0.101564 0.76953,0.152345 1.14844,0.152344 0.50781,10e-7 0.89843,-0.08594 1.17187,-0.257812 0.27344,-0.17578 0.41015,-0.421874 0.41016,-0.738282 -10e-6,-0.292966 -0.0996,-0.517575 -0.29883,-0.673828 -0.19532,-0.156247 -0.62696,-0.306638 -1.29492,-0.451172 l -0.375,-0.08789 c -0.66797,-0.140622 -1.15039,-0.355466 -1.44727,-0.644531 -0.29687,-0.292965 -0.44531,-0.693355 -0.44531,-1.201172 0,-0.617182 0.21875,-1.093744 0.65625,-1.429688 0.4375,-0.335931 1.05859,-0.503899 1.86328,-0.503906 0.39844,7e-6 0.77344,0.0293 1.125,0.08789 0.35156,0.0586 0.67578,0.14649 0.97266,0.263671"
+         style=""
+         id="path5644" />
+      <path
+         d="m 274.42627,34.335796 0,-3.972656 1.07812,0 0,3.931641 c 0,0.621095 0.1211,1.087892 0.36329,1.40039 0.24218,0.308595 0.60546,0.462892 1.08984,0.462891 0.58203,10e-7 1.04101,-0.185546 1.37695,-0.556641 0.33984,-0.371092 0.50976,-0.876951 0.50977,-1.517578 l 0,-3.720703 1.07812,0 0,6.5625 -1.07812,0 0,-1.007812 c -0.26173,0.398438 -0.56641,0.695312 -0.91406,0.890625 -0.34376,0.191406 -0.74415,0.287109 -1.20118,0.287109 -0.7539,0 -1.32617,-0.234375 -1.71679,-0.703125 -0.39063,-0.468749 -0.58594,-1.154295 -0.58594,-2.056641"
+         style=""
+         id="path5646" />
+      <path
+         d="m 283.19775,35.941265 0,3.480469 -1.08398,0 0,-9.058594 1.08398,0 0,0.996094 c 0.22656,-0.390619 0.51172,-0.679681 0.85547,-0.867188 0.34766,-0.191399 0.76172,-0.287102 1.24219,-0.287109 0.79687,7e-6 1.44335,0.316413 1.93945,0.949219 0.5,0.632817 0.75,1.464848 0.75,2.496093 0,1.031253 -0.25,1.863283 -0.75,2.496094 -0.4961,0.632813 -1.14258,0.949219 -1.93945,0.949219 -0.48047,0 -0.89453,-0.09375 -1.24219,-0.28125 -0.34375,-0.191406 -0.62891,-0.482421 -0.85547,-0.873047 m 3.66797,-2.291016 c 0,-0.792964 -0.16407,-1.414057 -0.49218,-1.863281 -0.32423,-0.453119 -0.77149,-0.679681 -1.3418,-0.679687 -0.57032,6e-6 -1.01954,0.226568 -1.34766,0.679687 -0.32422,0.449224 -0.48633,1.070317 -0.48633,1.863281 0,0.792972 0.16211,1.416018 0.48633,1.869141 0.32812,0.44922 0.77734,0.673829 1.34766,0.673828 0.57031,10e-7 1.01757,-0.224608 1.3418,-0.673828 0.32811,-0.453123 0.49218,-1.076169 0.49218,-1.869141"
+         style=""
+         id="path5648" />
+      <path
+         d="m 295.38525,33.374859 0,0.527344 -4.95703,0 c 0.0469,0.742189 0.26953,1.308595 0.66797,1.699218 0.40234,0.38672 0.96094,0.580079 1.67578,0.580078 0.41406,10e-7 0.81445,-0.05078 1.20117,-0.152343 0.39062,-0.101562 0.77734,-0.253905 1.16016,-0.457032 l 0,1.019532 c -0.38672,0.164062 -0.78321,0.289062 -1.18945,0.375 -0.40626,0.08594 -0.81837,0.128906 -1.23633,0.128906 -1.04688,0 -1.87696,-0.304687 -2.49023,-0.914063 -0.60938,-0.609373 -0.91407,-1.433591 -0.91407,-2.472656 0,-1.074214 0.28906,-1.925776 0.86719,-2.554687 0.58203,-0.632806 1.36523,-0.949212 2.34961,-0.949219 0.88281,7e-6 1.58007,0.285163 2.0918,0.855469 0.51561,0.566411 0.77343,1.337895 0.77343,2.314453 m -1.07812,-0.316406 c -0.008,-0.58984 -0.17383,-1.060542 -0.49805,-1.41211 -0.32032,-0.351557 -0.7461,-0.527338 -1.27734,-0.527344 -0.60157,6e-6 -1.08399,0.169928 -1.44727,0.509766 -0.35937,0.339849 -0.56641,0.818364 -0.62109,1.435547 l 3.84375,-0.0059"
+         style=""
+         id="path5650" />
+      <path
+         d="m 300.93408,31.370953 c -0.1211,-0.07031 -0.25391,-0.121088 -0.39844,-0.152344 -0.14062,-0.03515 -0.29687,-0.05273 -0.46875,-0.05274 -0.60937,6e-6 -1.07812,0.199225 -1.40625,0.597657 -0.32422,0.394536 -0.48633,0.962895 -0.48632,1.705078 l 0,3.457031 -1.08399,0 0,-6.5625 1.08399,0 0,1.019531 c 0.22656,-0.398431 0.52148,-0.693353 0.88476,-0.884765 0.36328,-0.195306 0.80469,-0.292962 1.32422,-0.292969 0.0742,7e-6 0.15625,0.0059 0.24609,0.01758 0.0898,0.0078 0.18945,0.02149 0.29883,0.04102 l 0.006,1.107422"
+         style=""
+         id="path5652" />
+      <path
+         d="m 306.5415,30.615093 0,1.007813 c -0.30469,-0.167964 -0.61133,-0.292963 -0.91992,-0.375 -0.30469,-0.08593 -0.61328,-0.128901 -0.92578,-0.128907 -0.69922,6e-6 -1.24219,0.222662 -1.62891,0.667969 -0.38672,0.441411 -0.58008,1.062504 -0.58007,1.863281 -1e-5,0.800784 0.19335,1.42383 0.58007,1.869141 0.38672,0.441407 0.92969,0.66211 1.62891,0.662109 0.3125,10e-7 0.62109,-0.04101 0.92578,-0.123046 0.30859,-0.08594 0.61523,-0.21289 0.91992,-0.38086 l 0,0.996094 c -0.30078,0.140625 -0.61328,0.246094 -0.9375,0.316406 -0.32031,0.07031 -0.66211,0.105469 -1.02539,0.105469 -0.98828,0 -1.77344,-0.310547 -2.35547,-0.931641 -0.58203,-0.621092 -0.87304,-1.458982 -0.87304,-2.513672 0,-1.070308 0.29297,-1.912104 0.8789,-2.52539 0.58985,-0.613275 1.39649,-0.919915 2.41993,-0.919922 0.33202,7e-6 0.65624,0.03516 0.97265,0.105469 0.3164,0.06641 0.62304,0.167975 0.91992,0.304687"
+         style=""
+         id="path5654" />
+      <path
+         d="m 310.94775,31.118999 c -0.57812,6e-6 -1.03515,0.226569 -1.37109,0.679688 -0.33594,0.449223 -0.50391,1.06641 -0.50391,1.851562 0,0.785159 0.16602,1.404299 0.49805,1.857422 0.33594,0.44922 0.79492,0.673829 1.37695,0.673828 0.57422,10e-7 1.0293,-0.226561 1.36524,-0.679687 0.33593,-0.453123 0.5039,-1.07031 0.5039,-1.851563 0,-0.777339 -0.16797,-1.392573 -0.5039,-1.845703 -0.33594,-0.457025 -0.79102,-0.685541 -1.36524,-0.685547 m 0,-0.914062 c 0.9375,7e-6 1.67383,0.304694 2.20899,0.914062 0.53515,0.609381 0.80273,1.45313 0.80273,2.53125 0,1.074221 -0.26758,1.917971 -0.80273,2.53125 -0.53516,0.609376 -1.27149,0.914063 -2.20899,0.914063 -0.94141,0 -1.67969,-0.304687 -2.21484,-0.914063 -0.53125,-0.613279 -0.79688,-1.457029 -0.79687,-2.53125 -10e-6,-1.07812 0.26562,-1.921869 0.79687,-2.53125 0.53515,-0.609368 1.27343,-0.914055 2.21484,-0.914062"
+         style=""
+         id="path5656" />
+      <path
+         d="m 321.1958,32.964703 0,3.960937 -1.07812,0 0,-3.925781 c -1e-5,-0.621089 -0.1211,-1.085933 -0.36329,-1.394531 -0.24219,-0.308589 -0.60547,-0.462885 -1.08984,-0.462891 -0.58203,6e-6 -1.04102,0.185552 -1.37695,0.556641 -0.33594,0.371098 -0.50391,0.876957 -0.50391,1.517578 l 0,3.708984 -1.08398,0 0,-6.5625 1.08398,0 0,1.019531 c 0.25781,-0.394525 0.56055,-0.689447 0.9082,-0.884765 0.35156,-0.195306 0.75586,-0.292962 1.2129,-0.292969 0.7539,7e-6 1.32421,0.234381 1.71093,0.703125 0.38672,0.464849 0.58007,1.150395 0.58008,2.056641"
+         style=""
+         id="path5658" />
+      <path
+         d="m 327.67627,31.359234 0,-3.550781 1.07812,0 0,9.117187 -1.07812,0 0,-0.984375 c -0.22657,0.390626 -0.51368,0.681641 -0.86133,0.873047 -0.34375,0.1875 -0.75781,0.28125 -1.24219,0.28125 -0.79297,0 -1.43945,-0.316406 -1.93945,-0.949219 -0.49609,-0.632811 -0.74414,-1.464841 -0.74414,-2.496094 0,-1.031245 0.24805,-1.863276 0.74414,-2.496093 0.5,-0.632806 1.14648,-0.949212 1.93945,-0.949219 0.48438,7e-6 0.89844,0.09571 1.24219,0.287109 0.34765,0.187507 0.63476,0.476569 0.86133,0.867188 m -3.67383,2.291015 c 0,0.792972 0.16211,1.416018 0.48633,1.869141 0.32812,0.44922 0.77734,0.673829 1.34766,0.673828 0.5703,10e-7 1.01952,-0.224608 1.34765,-0.673828 0.32812,-0.453123 0.49218,-1.076169 0.49219,-1.869141 -10e-6,-0.792964 -0.16407,-1.414057 -0.49219,-1.863281 -0.32813,-0.453119 -0.77735,-0.679681 -1.34765,-0.679687 -0.57032,6e-6 -1.01954,0.226568 -1.34766,0.679687 -0.32422,0.449224 -0.48633,1.070317 -0.48633,1.863281"
+         style=""
+         id="path5660" />
+      <path
+         d="m 330.86377,34.335796 0,-3.972656 1.07812,0 0,3.931641 c 0,0.621095 0.1211,1.087892 0.36329,1.40039 0.24218,0.308595 0.60546,0.462892 1.08984,0.462891 0.58203,10e-7 1.04101,-0.185546 1.37695,-0.556641 0.33984,-0.371092 0.50976,-0.876951 0.50977,-1.517578 l 0,-3.720703 1.07812,0 0,6.5625 -1.07812,0 0,-1.007812 c -0.26173,0.398438 -0.56641,0.695312 -0.91406,0.890625 -0.34376,0.191406 -0.74415,0.287109 -1.20118,0.287109 -0.7539,0 -1.32617,-0.234375 -1.71679,-0.703125 -0.39063,-0.468749 -0.58594,-1.154295 -0.58594,-2.056641"
+         style=""
+         id="path5662" />
+      <path
+         d="m 343.31494,30.615093 0,1.007813 c -0.30469,-0.167964 -0.61133,-0.292963 -0.91992,-0.375 -0.30469,-0.08593 -0.61329,-0.128901 -0.92578,-0.128907 -0.69922,6e-6 -1.24219,0.222662 -1.62891,0.667969 -0.38672,0.441411 -0.58008,1.062504 -0.58008,1.863281 0,0.800784 0.19336,1.42383 0.58008,1.869141 0.38672,0.441407 0.92969,0.66211 1.62891,0.662109 0.31249,10e-7 0.62109,-0.04101 0.92578,-0.123046 0.30859,-0.08594 0.61523,-0.21289 0.91992,-0.38086 l 0,0.996094 c -0.30079,0.140625 -0.61329,0.246094 -0.9375,0.316406 -0.32032,0.07031 -0.66211,0.105469 -1.02539,0.105469 -0.98828,0 -1.77344,-0.310547 -2.35547,-0.931641 -0.58203,-0.621092 -0.87305,-1.458982 -0.87304,-2.513672 -10e-6,-1.070308 0.29296,-1.912104 0.8789,-2.52539 0.58984,-0.613275 1.39648,-0.919915 2.41992,-0.919922 0.33203,7e-6 0.65625,0.03516 0.97266,0.105469 0.3164,0.06641 0.62304,0.167975 0.91992,0.304687"
+         style=""
+         id="path5664" />
+      <path
+         d="m 346.24463,28.499859 0,1.863281 2.2207,0 0,0.837891 -2.2207,0 0,3.5625 c 0,0.535158 0.0723,0.878907 0.2168,1.03125 0.14843,0.152344 0.44726,0.228516 0.89648,0.228515 l 1.10742,0 0,0.902344 -1.10742,0 c -0.83203,0 -1.40625,-0.154297 -1.72266,-0.462891 -0.3164,-0.312499 -0.47461,-0.878904 -0.47461,-1.699218 l 0,-3.5625 -0.79101,0 0,-0.837891 0.79101,0 0,-1.863281 1.08399,0"
+         style=""
+         id="path5666" />
+      <path
+         d="m 352.43213,31.118999 c -0.57813,6e-6 -1.03516,0.226569 -1.37109,0.679688 -0.33594,0.449223 -0.50391,1.06641 -0.50391,1.851562 0,0.785159 0.16601,1.404299 0.49805,1.857422 0.33593,0.44922 0.79491,0.673829 1.37695,0.673828 0.57421,10e-7 1.02929,-0.226561 1.36523,-0.679687 0.33594,-0.453123 0.5039,-1.07031 0.50391,-1.851563 -10e-6,-0.777339 -0.16797,-1.392573 -0.50391,-1.845703 -0.33594,-0.457025 -0.79102,-0.685541 -1.36523,-0.685547 m 0,-0.914062 c 0.93749,7e-6 1.67382,0.304694 2.20898,0.914062 0.53515,0.609381 0.80273,1.45313 0.80274,2.53125 -10e-6,1.074221 -0.26759,1.917971 -0.80274,2.53125 -0.53516,0.609376 -1.27149,0.914063 -2.20898,0.914063 -0.94141,0 -1.67969,-0.304687 -2.21484,-0.914063 -0.53126,-0.613279 -0.79688,-1.457029 -0.79688,-2.53125 0,-1.07812 0.26562,-1.921869 0.79688,-2.53125 0.53515,-0.609368 1.27343,-0.914055 2.21484,-0.914062"
+         style=""
+         id="path5668" />
+      <path
+         d="m 361.02783,31.370953 c -0.1211,-0.07031 -0.25391,-0.121088 -0.39844,-0.152344 -0.14062,-0.03515 -0.29687,-0.05273 -0.46875,-0.05274 -0.60937,6e-6 -1.07812,0.199225 -1.40625,0.597657 -0.32422,0.394536 -0.48633,0.962895 -0.48632,1.705078 l 0,3.457031 -1.08399,0 0,-6.5625 1.08399,0 0,1.019531 c 0.22656,-0.398431 0.52148,-0.693353 0.88476,-0.884765 0.36328,-0.195306 0.80469,-0.292962 1.32422,-0.292969 0.0742,7e-6 0.15625,0.0059 0.24609,0.01758 0.0898,0.0078 0.18945,0.02149 0.29883,0.04102 l 0.006,1.107422"
+         style=""
+         id="path5670" />
+    </g>
+    <g
+       style="font-size:12px;font-style:normal;font-variant:normal;font-weight:normal;font-stretch:normal;fill:#000000;fill-opacity:1;stroke:none;font-family:Times;-inkscape-font-specification:Times"
+       id="text5164">
+      <path
+         d="m 185.30331,121.15741 0,1.86328 2.22071,0 0,0.83789 -2.22071,0 0,3.5625 c 0,0.53516 0.0723,0.87891 0.2168,1.03125 0.14844,0.15235 0.44726,0.22852 0.89649,0.22852 l 1.10742,0 0,0.90234 -1.10742,0 c -0.83204,0 -1.40626,-0.1543 -1.72266,-0.46289 -0.31641,-0.3125 -0.47461,-0.8789 -0.47461,-1.69922 l 0,-3.5625 -0.79102,0 0,-0.83789 0.79102,0 0,-1.86328 1.08398,0"
+         style=""
+         id="path5673" />
+      <path
+         d="m 188.83652,126.99335 0,-3.97266 1.07812,0 0,3.93164 c 0,0.6211 0.12109,1.08789 0.36328,1.40039 0.24219,0.3086 0.60547,0.46289 1.08985,0.46289 0.58202,0 1.04101,-0.18554 1.37695,-0.55664 0.33984,-0.37109 0.50976,-0.87695 0.50977,-1.51758 l 0,-3.7207 1.07812,0 0,6.5625 -1.07812,0 0,-1.00781 c -0.26173,0.39844 -0.56642,0.69531 -0.91407,0.89062 -0.34375,0.19141 -0.74414,0.28711 -1.20117,0.28711 -0.75391,0 -1.32617,-0.23437 -1.7168,-0.70312 -0.39062,-0.46875 -0.58593,-1.1543 -0.58593,-2.05664"
+         style=""
+         id="path5675" />
+      <path
+         d="m 202.02011,125.62225 0,3.96094 -1.07812,0 0,-3.92578 c -1e-5,-0.62109 -0.1211,-1.08593 -0.36329,-1.39453 -0.24219,-0.30859 -0.60547,-0.46289 -1.08984,-0.46289 -0.58203,0 -1.04102,0.18555 -1.37695,0.55664 -0.33594,0.3711 -0.50391,0.87696 -0.50391,1.51758 l 0,3.70898 -1.08398,0 0,-6.5625 1.08398,0 0,1.01953 c 0.25781,-0.39452 0.56055,-0.68944 0.9082,-0.88476 0.35156,-0.19531 0.75586,-0.29297 1.2129,-0.29297 0.7539,0 1.32421,0.23438 1.71093,0.70312 0.38672,0.46485 0.58007,1.1504 0.58008,2.05664"
+         style=""
+         id="path5677" />
+      <path
+         d="m 209.6373,125.62225 0,3.96094 -1.07813,0 0,-3.92578 c 0,-0.62109 -0.1211,-1.08593 -0.36328,-1.39453 -0.24219,-0.30859 -0.60547,-0.46289 -1.08984,-0.46289 -0.58204,0 -1.04102,0.18555 -1.37695,0.55664 -0.33594,0.3711 -0.50391,0.87696 -0.50391,1.51758 l 0,3.70898 -1.08399,0 0,-6.5625 1.08399,0 0,1.01953 c 0.25781,-0.39452 0.56054,-0.68944 0.9082,-0.88476 0.35156,-0.19531 0.75586,-0.29297 1.21289,-0.29297 0.7539,0 1.32422,0.23438 1.71094,0.70312 0.38671,0.46485 0.58007,1.1504 0.58008,2.05664"
+         style=""
+         id="path5679" />
+      <path
+         d="m 217.41269,126.03241 0,0.52734 -4.95703,0 c 0.0469,0.74219 0.26953,1.3086 0.66797,1.69922 0.40234,0.38672 0.96093,0.58008 1.67578,0.58008 0.41406,0 0.81445,-0.0508 1.20117,-0.15234 0.39062,-0.10156 0.77734,-0.25391 1.16016,-0.45703 l 0,1.01953 c -0.38673,0.16406 -0.78321,0.28906 -1.18946,0.375 -0.40625,0.0859 -0.81836,0.1289 -1.23633,0.1289 -1.04687,0 -1.87695,-0.30468 -2.49023,-0.91406 -0.60938,-0.60937 -0.91406,-1.43359 -0.91406,-2.47266 0,-1.07421 0.28906,-1.92577 0.86719,-2.55468 0.58202,-0.63281 1.36523,-0.94922 2.3496,-0.94922 0.88281,0 1.58008,0.28516 2.0918,0.85547 0.51562,0.56641 0.77343,1.33789 0.77344,2.31445 m -1.07813,-0.31641 c -0.008,-0.58984 -0.17383,-1.06054 -0.49804,-1.41211 -0.32032,-0.35155 -0.7461,-0.52733 -1.27735,-0.52734 -0.60156,1e-5 -1.08398,0.16993 -1.44726,0.50977 -0.35938,0.33984 -0.56641,0.81836 -0.6211,1.43554 l 3.84375,-0.006"
+         style=""
+         id="path5681" />
+      <path
+         d="m 219.15878,120.466 1.07813,0 0,9.11719 -1.07813,0 0,-9.11719"
+         style=""
+         id="path5683" />
+      <path
+         d="m 231.01816,126.3078 c -1e-5,-0.79296 -0.16407,-1.41406 -0.49219,-1.86328 -0.32422,-0.45312 -0.77149,-0.67968 -1.3418,-0.67969 -0.57031,1e-5 -1.01953,0.22657 -1.34765,0.67969 -0.32422,0.44922 -0.48633,1.07032 -0.48633,1.86328 0,0.79297 0.16211,1.41602 0.48633,1.86914 0.32812,0.44922 0.77734,0.67383 1.34765,0.67383 0.57031,0 1.01758,-0.22461 1.3418,-0.67383 0.32812,-0.45312 0.49218,-1.07617 0.49219,-1.86914 m -3.66797,-2.29102 c 0.22656,-0.39061 0.51172,-0.67968 0.85547,-0.86718 0.34765,-0.1914 0.76171,-0.28711 1.24219,-0.28711 0.79687,0 1.44335,0.31641 1.93945,0.94922 0.49999,0.63281 0.74999,1.46484 0.75,2.49609 -1e-5,1.03125 -0.25001,1.86328 -0.75,2.49609 -0.4961,0.63282 -1.14258,0.94922 -1.93945,0.94922 -0.48048,0 -0.89454,-0.0937 -1.24219,-0.28125 -0.34375,-0.1914 -0.62891,-0.48242 -0.85547,-0.87304 l 0,0.98437 -1.08399,0 0,-9.11719 1.08399,0 0,3.55078"
+         style=""
+         id="path5685" />
+      <path
+         d="m 236.90683,126.28436 c -0.8711,10e-6 -1.47461,0.0996 -1.81055,0.29883 -0.33594,0.19922 -0.50391,0.53907 -0.5039,1.01953 -1e-5,0.38282 0.12499,0.6875 0.375,0.91406 0.2539,0.22266 0.59765,0.33399 1.03125,0.33399 0.59765,0 1.07616,-0.21094 1.43554,-0.63281 0.36328,-0.42578 0.54492,-0.99024 0.54493,-1.69336 l 0,-0.24024 -1.07227,0 m 2.15039,-0.44531 0,3.74414 -1.07812,0 0,-0.99609 c -0.2461,0.39844 -0.55274,0.69336 -0.91993,0.88476 -0.36719,0.1875 -0.81641,0.28125 -1.34765,0.28125 -0.67188,0 -1.20704,-0.1875 -1.60547,-0.5625 -0.39453,-0.3789 -0.5918,-0.88476 -0.5918,-1.51758 0,-0.73827 0.24609,-1.29491 0.73828,-1.66992 0.49609,-0.37499 1.23438,-0.56249 2.21485,-0.5625 l 1.51172,0 0,-0.10547 c -10e-6,-0.49608 -0.16407,-0.8789 -0.49219,-1.14843 -0.32423,-0.27344 -0.78126,-0.41015 -1.3711,-0.41016 -0.375,1e-5 -0.74023,0.0449 -1.0957,0.13477 -0.35547,0.0898 -0.69727,0.22461 -1.02539,0.40429 l 0,-0.99609 c 0.39453,-0.15234 0.77734,-0.26562 1.14844,-0.33984 0.37109,-0.0781 0.73242,-0.11719 1.08398,-0.11719 0.94922,0 1.6582,0.2461 2.12696,0.73828 0.46874,0.49219 0.70311,1.23829 0.70312,2.23828"
+         style=""
+         id="path5687" />
+      <path
+         d="m 245.10995,124.0285 c -0.12109,-0.0703 -0.25391,-0.12108 -0.39843,-0.15234 -0.14063,-0.0352 -0.29688,-0.0527 -0.46875,-0.0527 -0.60938,0 -1.07813,0.19922 -1.40625,0.59765 -0.32422,0.39454 -0.48633,0.9629 -0.48633,1.70508 l 0,3.45703 -1.08399,0 0,-6.5625 1.08399,0 0,1.01953 c 0.22656,-0.39843 0.52148,-0.69335 0.88476,-0.88476 0.36328,-0.19531 0.80469,-0.29297 1.32422,-0.29297 0.0742,0 0.15625,0.006 0.2461,0.0176 0.0898,0.008 0.18945,0.0215 0.29883,0.041 l 0.006,1.10742"
+         style=""
+         id="path5689" />
+      <path
+         d="m 249.84433,124.0285 c -0.1211,-0.0703 -0.25391,-0.12108 -0.39844,-0.15234 -0.14063,-0.0352 -0.29688,-0.0527 -0.46875,-0.0527 -0.60938,0 -1.07813,0.19922 -1.40625,0.59765 -0.32422,0.39454 -0.48633,0.9629 -0.48633,1.70508 l 0,3.45703 -1.08398,0 0,-6.5625 1.08398,0 0,1.01953 c 0.22656,-0.39843 0.52149,-0.69335 0.88477,-0.88476 0.36328,-0.19531 0.80468,-0.29297 1.32422,-0.29297 0.0742,0 0.15624,0.006 0.24609,0.0176 0.0898,0.008 0.18945,0.0215 0.29883,0.041 l 0.006,1.10742"
+         style=""
+         id="path5691" />
+      <path
+         d="m 250.98691,123.02069 1.07812,0 0,6.5625 -1.07812,0 0,-6.5625 m 0,-2.55469 1.07812,0 0,1.36524 -1.07812,0 0,-1.36524"
+         style=""
+         id="path5693" />
+      <path
+         d="m 259.92831,126.03241 0,0.52734 -4.95703,0 c 0.0469,0.74219 0.26953,1.3086 0.66797,1.69922 0.40234,0.38672 0.96094,0.58008 1.67578,0.58008 0.41406,0 0.81445,-0.0508 1.20117,-0.15234 0.39062,-0.10156 0.77734,-0.25391 1.16016,-0.45703 l 0,1.01953 c -0.38672,0.16406 -0.78321,0.28906 -1.18945,0.375 -0.40626,0.0859 -0.81837,0.1289 -1.23633,0.1289 -1.04688,0 -1.87696,-0.30468 -2.49023,-0.91406 -0.60938,-0.60937 -0.91407,-1.43359 -0.91407,-2.47266 0,-1.07421 0.28906,-1.92577 0.86719,-2.55468 0.58203,-0.63281 1.36523,-0.94922 2.34961,-0.94922 0.88281,0 1.58007,0.28516 2.0918,0.85547 0.51562,0.56641 0.77343,1.33789 0.77343,2.31445 m -1.07812,-0.31641 c -0.008,-0.58984 -0.17383,-1.06054 -0.49805,-1.41211 -0.32032,-0.35155 -0.7461,-0.52733 -1.27734,-0.52734 -0.60157,1e-5 -1.08399,0.16993 -1.44727,0.50977 -0.35937,0.33984 -0.56641,0.81836 -0.62109,1.43554 l 3.84375,-0.006"
+         style=""
+         id="path5695" />
+      <path
+         d="m 265.47714,124.0285 c -0.1211,-0.0703 -0.25391,-0.12108 -0.39844,-0.15234 -0.14062,-0.0352 -0.29687,-0.0527 -0.46875,-0.0527 -0.60937,0 -1.07812,0.19922 -1.40625,0.59765 -0.32422,0.39454 -0.48633,0.9629 -0.48632,1.70508 l 0,3.45703 -1.08399,0 0,-6.5625 1.08399,0 0,1.01953 c 0.22656,-0.39843 0.52148,-0.69335 0.88476,-0.88476 0.36328,-0.19531 0.80469,-0.29297 1.32422,-0.29297 0.0742,0 0.15625,0.006 0.24609,0.0176 0.0898,0.008 0.18945,0.0215 0.29883,0.041 l 0.006,1.10742"
+         style=""
+         id="path5697" />
+    </g>
+    <path
+       style="fill:none;stroke:#000000;stroke-width:1.41732287;stroke-linecap:butt;stroke-linejoin:miter;stroke-miterlimit:4;stroke-opacity:1;stroke-dasharray:none;marker-end:url(#Arrow1Mend)"
+       d="M 99.212598,136.49111 109.53456,122.94866"
+       id="path5168"
+       transform="translate(114.19886,-19.255464)" />
+  </g>
+</svg>
diff --git a/doc/source/tutorial/spin_potential_shape.rst b/doc/source/tutorial/spin_potential_shape.rst
index 0b154600556813909cc2f990ff9549f14b41254d..bc3b1cdc55adb3f33af20c98c58564042e11510a 100644
--- a/doc/source/tutorial/spin_potential_shape.rst
+++ b/doc/source/tutorial/spin_potential_shape.rst
@@ -414,7 +414,7 @@ Up to now, we only dealt with simple wire geometries. Now we turn to the case
 of a more complex geometry, namely transport through a quantum ring
 that is pierced by a magnetic flux :math:`\Phi`:
 
-.. image:: /code/figure/ab_ring_sketch.*
+.. image:: /figure/ab_ring_sketch.*
 
 For a flux line, it is possible to choose a gauge such that a
 charged particle acquires a phase :math:`e\Phi/h` whenever it
@@ -551,7 +551,7 @@ back (going opposite to the direction of the translational vector)
 until it intersects the scattering region. At this intersection,
 the lead is attached:
 
-.. image:: /code/figure/ab_ring_sketch2.*
+.. image:: /figure/ab_ring_sketch2.*
 
 After the lead has been attached, the system should look like this:
 
diff --git a/doc/source/tutorial/superconductors.rst b/doc/source/tutorial/superconductors.rst
index 685ac4d425e8c2a3de5ef213e4f7448ce1eeceb8..0c1c3739c9a820739e5108e6692ba0cfa8fe710c 100644
--- a/doc/source/tutorial/superconductors.rst
+++ b/doc/source/tutorial/superconductors.rst
@@ -81,7 +81,7 @@ of freedom.
 Let us consider a system that consists of a normal lead on the left,
 a superconductor on the right, and a tunnel barrier in between:
 
-.. image:: /code/figure/superconductor_transport_sketch.*
+.. image:: /figure/superconductor_transport_sketch.*
 
 We implement the BdG Hamiltonian in Kwant using a 2x2 matrix structure
 for all Hamiltonian matrix elements, as we did