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I am using 4.6. when I plot a surface from a data file with pm3d and contours on surface the contours seem to be drawn after the surface so the part of the contour that is supposed to be hidden by the surface is visible. any way to avoid that?
Have you tried "set hidden"?
This works for me:
set contour surface
plot foo with pm3d, foo with lines nosurface
it works thanks