[Gnuplot-info] color mixing in pm3d map

[dups <nic...@vo...>]

Hello
I would like to splot a map in pm3d with this kind of file:

x y  R1  R2

0 0 0.2 0.8
1 0 0.3 0.7
2 0 0.5 0.5
...
0 1 0.4 0.6
1 1 0.3 0.7
2 1 1    0
...etc
In this file R1+R2=1 (all the time)

I would like to attribute a different color for both R1 and R2 columns.
For example if I attribute red to R1 and yellow to R2 and that I plot 
 the point defined by third line of the example (2,0,0.5,0.5) the result 
should be orange at the point x=2 and y=0.
Is it possible to do such a map??
I hope I have been clear enough..

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