diff --git a/matlab/TCV_IMAS/plot_connection_matrices.m b/matlab/TCV_IMAS/plot_connection_matrices.m
index 0d452f90fe356a52ca1739dc570c2b14ac843d64..d575d0480a8927fae3c2cb48f781c412e7d0ff07 100644
--- a/matlab/TCV_IMAS/plot_connection_matrices.m
+++ b/matlab/TCV_IMAS/plot_connection_matrices.m
@@ -44,6 +44,8 @@ for kk=1:info_pf_active.ntotcircuits
     xlab{index} = [addcolor info_pf_active.coil{ii}.name 'out'];
   end
   
+  xlab = strrep(xlab,'_','\_'); % since we need the tex interpreter for colors
+  
   shg
   axis ij
   ax = gca;
@@ -51,6 +53,6 @@ for kk=1:info_pf_active.ntotcircuits
   xlabel('Element name. (red) Elemement belonging to circuit. (green) power supplies. (black) coils');
   ylabel('Node');
   title(['Circuit ' num2str(kk) ': ' info_pf_active.circuit{kk}.name])
-  set(ax,'Xtick', xti, 'Ytick', yti, 'XTickLabel', xlab, 'YTickLabel', ylab')
+  set(ax,'Xtick', xti, 'Ytick', yti, 'XTickLabel', xlab, 'YTickLabel', ylab', 'XTickLabelRotation', 90)
   
 end