Fig. 1From: Gene flow analysis method, the D-statistic, is robust in a wide parameter spaceA four-taxon tree required to implement the D-statistic. The four taxa are designated as H1, H2, H3 and H4, with H4 serving as the outgroup. Gene flow between H2 and H3 (shown with arrows) or H1 and H3 can be detected with the D-statistic. T3, T2 and Tgfdenotes the time passed since each event.Back to article page