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Contour surfaces for 3 sub-groups when mixing is preferential (A) or proportional (B). Plot C superimposes the surfaces in A and B. Parameter values are a1 = 8, a2 = 12, a3 = 10, N1 = N2 = N3 = 500, and ε1 = ε2 = ε3 = ε with ε = 0.4 in A and ε = 0 in B.
