Hello R-helpers

  I want to put a color scale in a plot:
  
I've got an xy plot where the values of the response (z=f(x,y)) is symbolically given by colors (like heat or rainbow color scale)
I would like to put such a scale with apprpriates labels in the plot, so as to facilitate the interpretation (like in a finite elements result plot)
How is taht possible?

Thanks
Anne
  
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