Figure S4.

PCA of Additional Samples Removed from Figure 2, Related to Figure 2

Principal Components Analysis (PCA) of ancient samples projected onto modern individuals from the Andes and Amazon region (Barbieri et al., 2019). Eigenvector 1 coordinates were reversed so that the PCA correlates with geographical structure. Ancient individuals of Figure 2 are shown on a blue-red latitudinal gradient. Modern individuals are in gray. In black are all individuals that we removed from Figure 2 due to their outlier status reflecting distinctive histories that we discuss in the text (NorthChile individuals, Cusco individuals, the Argentinian Inca individual, and the Peru_Lauricocha_8600BP and Peru_Cuncaicha_9000BP individuals). The percentage of total variation explained by each PC is shown in parentheses on each axis.