Figure 3.

Proportion of derived alleles that are at higher frequency in higher-latitude populations as a function of ${\widehat{F}}_{\text{ST}}$ in North America. Dotted line represents the proportion in nonoverlapping ${\widehat{F}}_{\text{ST}}$ bins. Solid line represents the cumulative distribution of the dotted line. Left inset is the derived allele-frequency spectra for the two North American populations. Right inset is the genome-wide derived allele-frequency spectra for SNPs in the 0.99${\widehat{F}}_{\text{ST}}$ tail. Only SNPs segregating at a total frequency > 0.05 in North America were considered.