Fwd: How to make a non-symmetric color pallet around zero

Hi,

I'm trying to plot a figure that shows velocity perturbations by color
(results of seismic tomography). I want values at zero and around zero
to be white, but I don't want the color pallet to be symmetric. The
minimum and maximum values are different.
In order to force white to be around zero I use grd2cpt with the -T
option, however this forces the color pallet to be symmetric.
Any ideas on how to accomplish this? I need it to be automated, i.e,
not by manually editing the CPT file.

Thanks,

Shahar

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