Extended Data Fig. 5: Schematic of first alternative admixture graph.

Results are shown including ancient individuals from Taforalt in Morocco associated with the Iberomaurusian culture, with the Shum Laka individuals modelled as having a mixture of ancestry related to western Central African hunter-gatherers plus two additional components: one from within the main portion of the West African clade, and one that splits at nearly the same point as one of the sources that contributes ancestry to the Taforalt individuals. Branch lengths are not drawn to scale. Points at which multiple lineages are shown diverging simultaneously indicate splits that occur in short succession (the order of which we cannot confidently assess) but are not meant to represent exact multifurcations. *Proportion not well-constrained (for Mbuti, the sum of the two indicated proportions is well-constrained but not the separate values). Supplementary Information section 3 provides the full parameters of the inferred model.