Try something like this, set MAX_COLOUR to the highest value you expect 
to see from the functions.



  average pigment_map{

       [function{PR_FRed(x,y,z)/MAX_COLOUR} color_map{[0 rgb 0][1 rgb 
<1,0,0>*3*MAX_COLOUR]}]
       [function{PR_FGrn(x,y,z)/MAX_COLOUR} color_map{[0 rgb 0][1 rgb 
<0,1,0>*3*MAX_COLOUR]}]
       [function{PR_FBlu(x,y,z)/MAX_COLOUR} color_map{[0 rgb 0][1 rgb 
<0,0,1>*3*MAX_COLOUR]}]

     }

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