Each of the three sides of a ternary plot represents a proportion of 0%, with the point of the triangle opposite that base representing a proportion of 100%. As a proportion increases in any one sample, the point representing that sample moves from the base to the opposite point of the triangle.
Ternary Plot uses the Mixture column property to shade the portion of the graph that is out of bounds. The only constraints that the Ternary plot recognizes are the mixture sum and the mixture bounds. The Ternary plot does not recognize a general linear constraint like the Mixture Profiler does. For information about setting the Mixture column property in the Column Info window, see the Using JMP book.