Population structure of the Indians. Principal components analyses of the two Indian populations (HapMap Gujarati: GIH, SGVP Tamil Indians: INS) with other global populations across 112,925 SNPs. (A) The first two principal components (PCs) of GIH and INS with the remaining ten populations from Phase 3 of the International HapMap Project. (B) Second and third PCs of the PCA of GIH and INS with the ten HapMap3 populations. (C) First two PCs from the analysis of GIH, INS and the 45 Indo-European speaking samples and 46 Dravidian-language speaking samples from the paper by Reich and colleagues. (D) First two PCs from the analysis with only GIH and INS samples.