Additional graphing possibility?

[<Lar...@ao...>]

Dear sirs:
 
   I could not find any references to "ternary" or "mixture"  graphs/plots. 
 These are triangular graphs used to plot data when the three  data points 
add up to 100%.  They are used in geology, chemistry, baking,  rocket 
propellant compositions testing, etc.  When data are plotted, they  appear, 
typically, as contours on the triangularly-shaped graph.  Have I  just missed it 
or does GNUPlot not cover this type of graph?  Thank you for  your attention.
 
Sincerely,
Lawrence G. Teebken  (_larry79054@aol.com_ (mailto:lar...@ao...) )
P.S.:  I searched, in vain, for a 'contact us' box for asking  questions.  
I hope this is the proper procedure.