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Model of IUA. P1 and P2 split at time tP2. P3 splits from the ancestral population of P1 and P2, denoted P(12), at time tP3. A single episode of admixture takes place from P3 to P2 at time tGF. We denote by f the admixture proportion, which is the proportion of P3 ancestry in P2 individuals at time tGF. We denote by N3(t), N(12)(t), and N(123)(t) the size of populations P3, P(12), and P(123) at generation t in the past. The sizes of populations P1 and P2 do not influence D statistics.
