"chemical" plot

Hi all,

May be there is a plot which shows 3 variables in a triangle, their sum 
being constant. I have forgotten its name, and a search in the engine using 
"plot" did not help.

Does anyone know of such a procedure in R or S?

Thank you
--christian

Dr.sc.math.Christian W. Hoffmann
Mathematics and Statistical Computing
Landscape Dynamics and Spatial Development
Swiss Federal Research Institute WSL
Zuercherstrasse 111
CH-8903 Birmensdorf, Switzerland
phone: ++41-1-739 22 77    fax: ++41-1-739 22 15
e-mail: christian.hoffmann at wsl.ch
www: http://www.wsl.ch/staff/christian.hoffmann/

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