Fig. 4.

Assessing the fit of the models tested by the SpaceMix software. Each panel shows the decay in sample covariance as a function of observed geographic (red) and inferred geogenetic distance (black). (A) No Movement Model: Populations do not choose their own locations, nor can they draw admixture, that is, no migration and no admixture. (B) Source Model: Populations do not choose their own locations, but they do draw admixture, that is, admixture without long-distance migration. (C) Target Model: Populations choose their own locations, but no admixture, that is, migration without admixture. (D) Source and Target Model: Populations choose their own locations and they draw admixture, that is, migration and admixture.