Fig. 2
From: Episodes of gene flow and selection during the evolutionary history of domesticated barley
Inference of population splits with various numbers of population mixtures. TreeMix population graphs (left) and the residual matrices (right) are shown for modelling a zero migration (admixture) events, b 1 event, c 2 events, d 3 events, and e 4 events. Admixture is indicated by arrows that are coloured according to the inferred relative genetic contribution. All shown admixture edges improve the fit of the graphs to the data with the highest significance (p < 2.22507 × 10− 308), except the group II → group III migration on the panel d (2.10942 × 10−15), and the group IV → (groupIII, groupVI) migration on the panel e (1.11022 × 10−16). The residual matrices quantify the inter-group covariance of allelic frequencies not captured by the respective graphs, and thus indicate pairs of populations where additional gene flow edges might improve the fit