Centering the polar plot

docs/2_coordinates.md

@@ -69,7 +69,7 @@ In polar coordinates, the radius $r$ has a dimension of *length*, but
 the angular coordinate $\varphi$ is dimensionless.
 
 <figure markdown>
-  ![image](figures/Coordinates_7_0.svg)
+  ![polarplot](figures/Coordinates_7_0.svg){ width="auto" }
   <figcaption>In this example of a polar plot, you can distinguish the radial coordinate (0.2, 0.4 etc.) from the angular one expressed in degrees ($0^\circ$, $45^\circ$ etc.).</figcaption>
 </figure>