I have two filled contour maps. I want to overlap them and see the intersection region in a different color. I tried using contourf(X,Y,Z1) colormap winter hold on contourf(X,Y,Z2) colormap autumn alpha(0.4) Plz direct me to a link where this problem has been addressed. I tried reading what others have done, but it differs slightly or may be I am not aware of what they already know. Thanks..