After having this question answered through a link to an external site, I realized that I solved a problem, just to get another one: On a logarithm scale the C=Z parameter of MESH and SURF functions don't work very well. All you get is a blue graph, without the usual color gradient, that you get by passing 3 parameters.
How to revert that?
Have you looked at the caxis command? I could also suggest that you look at the CData and CDataMapping properties of the surface handle object. I hope these links point in the right direction.
I'll piggyback on @Azim's answer. Using caxis, you should be able to define logarithmic breakpoints for your color scheme, which will prevent your entire graph from going to blue. I don't remember if this can be done automatically with graph properties.
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