gray colormap with a light blue tone
cmap=bonecolormap(n)
:n integer >= 3, the colormap size. : :cmap matrix with 3 columns [R,G,B]. :
bonecolormap computes a gray colormap with a light blue tone.
f = `scf`_();
`plot3d1`_();
f.color_map = bonecolormap(32);