Extended Data Fig. 2: A graphical representation for the locus-specific branch lengths comparisons.
From: Ancient genomes reveal insights into ritual life at Chichén Itzá
The variables x, y and z, (representing either YCH vs. Iberians from Spain and Han from China, or TIX vs. Iberians and YCH, to independently test for selection) are calculated using pairwise FST distances, dAB, dBC and dAC, where x = (dAB + dAC – dBC)/2, y = (dAB +dBC – dAC)/2, z = (dAC + dBC – dAB)/2 and A, B and C are the three populations under consideration.