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Schematic of the population model used. A panmictic ancestral population (Ne = 104) splits at time T into two descendant populations 1 and 2 (both panmictic with Ne = 104). The migration rate (per individual per generation) between the descendant populations is m. Population 2 experiences a population bottleneck (a b-fold reduction in population size) 1,000 years in duration, and ending at time tb. 100-fold population growth commences at time g1 in population 1 and g2 in population 2.
