[R] Triangular filled contour plot

[kajo]

Hi all,

I am working on a filled contour plot which shows a triangular matrix data
set (as shown below). Is there a possibilty to draw a triangular filled
contour in a equilateral triangle (like a ternary plot)?

Thanks in advance
Johannes 

http://n4.nabble.com/file/n1557386/Bild3.png 
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