Residue Curve in a Ternary Equilateral Diagram

Consider a ternary mixture of chloroform, acetone, and methanol at . The vapor-liquid equilibrium (VLE) behavior is described by the modified Raoult's law with activity coefficients predicted by the Wilson model [1].
This mixture presents four azeotropes, whose locations and boiling points are:

This Demonstration plots the residue curve for user-selected positions of the locator (shown by a blue circle), which has to be inside the ternary equilateral diagram.