Fig. 2
From: Gene flow analysis method, the D-statistic, is robust in a wide parameter space
The species tree used for the coalescent-based gene tree simulation. Tgf, T2, T3 and T4 are respectively divergence or gene flow times of the corresponding event, measured in the unit of generations. H3a and H3b represent two independent samples from the same H3 population. H2f represents an introgressed lineage originating from the H2 population, and similarly H3f represents an introgressed lineage originating from the H3 population