typo

src/9_crystal_structure.md

@@ -683,7 +683,7 @@ The Wigner-Seitz cell is constructed as follows:
 2. Draw lines between the reference lattice point and the neighboring lattice points
 3. Draw perpendicular bisectrices of each line. 
 To do so, find the middle of the line connecting two lattice points and draw a line perpendicular to it.
-4. Extend the perpendicular bisectrices until these intercect. 
+4. Extend the perpendicular bisectrices until these intersect. 
 Doing so for each bisectrice yields the Wigner-Seitz cell.
 
 In panel E of the figure above we show the Wigner-Seitz cell of graphene by the red shaded area.