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Ancestral allele frequency spectrum using HapMap 2 and HGDP data. (a) Histograms of AAFs for four populations: Yoruba, USA, Han and OC (the two populations in Oceania were combined due to small sample sizes). N is the number of individuals and the slope is for the SNP counts in the range of 0.2–0.8 AAF. (b) Slopes of AAFs between 0.2 and 0.8 for all of the 53 populations versus geographic distance from Ethiopia.
