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Joint PBS distributions for 20-SNP windows across the genome for GBR-CHB-YRI on the x axis and X-CHB-YRI on the y axis, with X being (A) hunter-gatherer, (B) Early Farmer, and (C) Steppe. The boxes represent windows centered around UK Biobank skin pigmentation SNPs and are colored redder according to how much higher the light allele frequency is in X compared to YRI. Nearest genes are labeled. The orange and red lines represent the top 1 and 0.1 percentiles.
