http://en.wikipedia.org/wiki/Ternary_plot
A triangle
plot, or ternary plot, or de Finetti diagram, is a plot whose data set
functions along three variables and sum to a constant number. Because of
this, it is a visual display of the ratios of the three variables
within an equilateral triangle. The plot below shows the flammability of
methane as a function of two other variables, which are the presence in
what quantities of Nitrogen and Oxygen.
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