[pstricks] 2D color map

[Antoine Pairet]

Hi all!
What is the best way to create 2D color maps with PSTricks? I have data
files containing (x, y, z) values and I would like to plot a 2D area
which is filled by a specific color depending on the z-value. An example
of the result I am trying to obtain is attached to this email. 

Thank in advance,
Antoine
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