Figure 1.

PCA of 26 Indian Populations Showing the Siddis as an OG

The second eigenvector explains the separation of the OG population from other Indian populations. The first eigenvector explains the variation in the rest of the 25 population groups. Along the first eigenvector, the populations on the left are primarily Tibeto-Burman (TB)-speaking populations, who separate from the Indo-European (IE) and Dravidian (DR) speaking populations. The populations are coded by linguistic lineage (AA, Austro-Asiatic; IE, Indo-European; DR, Dravidian; and TB, Tibeto-Burman) followed by geographical location (N, north; NE, northeast; W, west; E, east; S, south; and C, central) and ethnic category (LP, castes; Sp, religious groups; and IP, tribes).