Fig. 2.

Illustration of simulation models. (a) Model 1, a basic model of four-population split with no admixture. (b) Model 2, a four-population split with subsequent admixture. (c) Model 3, a four-population model mimicking human demographic models. Population size changes in model 3 are omitted from the visualization for simplicity. Selection is simulated to operate on the branch that has a larger width.