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I'm plotting some triangle diagrams for percentages of weeds, grain and chaff in various samples. I have been using TRIDRAW which is easy to use, but produces graphics that need a fair bit of work before publication. Various other programmes for what geologists call ternary diagrams are listed at: http://www.mineralogie.uni-wuerzburg.de/links/drawing/ternary.html#share Does anyone have other favourite programmes for generating these plots? They are still very useful for visualising data. mark