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Specifying Line Color In Mesh And Surface Plots
Syntax    mesh(z, color option)
surface(z, color option)
See Also glevel , gcolor , mesh(z) and mesh(z, color option, x, y)

Description
Displays the mesh or surface plot specified by z and color option, in the current viewport , where color option is one of the colors listed in gcolor or it is equal to "levels". If it is a color, the lines in the resulting plot have the specified color. If it is "levels", the lines in the resulting plot change color in the manner specified by the glevel function.

Example
If you enter
     ginit
     x = -5. : 1. : 5.
     y = x'
     z = x * y / 10.
     glevel({-1.2, -.6, .6, 1.2})
     gcolor({"red", "green", "black", "lime", "blue"})
     gxtitle("x")
     gytitle("y")
     gztitle("z")
     surface(z, "levels")
 O-Matrix will generate a surface plot with red where z < -1.2, green where -1.2 < z < -.6, black where -.6 < z < .6, lime where .6 < z < 1.2, and blue where 1.2 < z .