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Map of the probability vector P = (p1, p2, p3) onto an equilateral triangle. Barycentric coordinates are used, i.e. the lengths of the perpendiculars from point P to the triangle sides are equal to the probabilities pi. The corners T1, T2, and T3 represent three quartet topologies with corresponding coordinates (probabilities) (1, 0, 0), (0, 1, 0), and (0, 0, 1).
