Citrin Ternary Contour Charts

Creating a ternary chart involves transforming three variables to ratios of three dependent proportions that are plotted in a 2-D simplex. Ternary contour is a 2-D projection of a ternary diagram that displays values of a 4^th dimension using a color scale.

In this contour chart, contouring method is by triangulation, and labeling the contours is not an option.