Below are links to a variety of programs and files that help one plot data in a ternary system, a common format in geosciences. Ternary diagrams are a convenient way to plot three-component systems. Formed in the shape of a triangle, each apex represents a different endmember, and data plotted within the triangle are located according to the proportions of those endmembers in the data points. The example below shows how data are plotted onto a ternary diagram. At the bottom of the page are some links to various ternary diagram plotting programs.