Fig. 2

IICR s for population split models. Inferred population size changes for population split models with one or two splitting events. In the four panels the two genes were sampled in the same deme. Panel a shows a model where one ancestral population of size 2N (red line) or N (green line) splits in two populations of size N at time T = 2. In panel b the ancestral population of size N splits in two populations of size N at different times. Panels c, d show a split with a three-island model and an ancestral population of size N (panel c) and 3N (panel d) at time T = 1 and 3. In all models the populations exchange genes at a rate M = 1 after the split. For comparison we also plotted the simulation and theoretical curves for a comparable n-island model (black lines)