matlab caxis
[x2,y2,z2] = sphere;
c2 = z2;
surf(x2,y2,z2,c2)
caxis([-1 3])
######################
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[x2,y2,z2] = sphere;
c2 = z2;
surf(x2,y2,z2,c2)
caxis([-1 3])
######################