CHG: testing matlab/python differences

Author: MathieuMorlighem

docs/using-issm/tutorials/squareiceshelf.md

@@ -43,9 +43,14 @@ Compute the velocity field of the ice shelf:
 ````
 
 Finally, generate a plot of the velocity:
-````
+``matlab
 >> plotmodel(md, 'data', md.results.StressbalanceSolution.Vel);
-````
+``
+<div style="background-color: rgb(50, 50, 50);">
+``python
+plotmodel(md, data=md.results.StressbalanceSolution.Vel)
+``
+</div>
 
 
 <div style="display:flow-root"><img style="float:left;width:100.00%" src="/ISSM-Documentation/assets/img/docs/using-issm/tutorials/squareiceshelf/squarevel.png" alt="Figure 1: squarevel"></div>