Syntax:
set surface unset surface show surface
The surface is drawn with the style specified by with, or else the appropriate style, data or function.
unset surface will cause splot to not draw points or lines corresponding
to any of the function or data file points. If you want to turn off the surface
for an individual function or data file while leaving the others active, use
the nosurface keyword in the splot command. Contours may still be drawn on
the surface, depending on the set contour option. The combination
unset surface; set contour base is useful for displaying contours on the grid
base. See also set contour (p. ).