Individual archaic ancestry coverage counts for Neanderthal-Unique (a), Denisovan-Unique (c) and All-Archaic (e) alleles in the 1000 Genomes populations in East Asia (green), Europe (blue), the Americas (red) and South Asia (purple), and mean values for ancestry coverage of each population at varying sample sizes (n = 1, 10, 25, 50, 75, 100, 125, 150) for SNPs with Neanderthal-Unique (b), Denisovan-Unique (d) and All-Archaic (f) alleles. The ancestry coverage values for n = 1 on plots b, d and f are the median values for each population in plots a, c and e. Populations are colour-coded by region, and abbreviations follow standard conventions established for the 1000 Genomes Project data.