Figure 8.

The fit of a linear decline of heterozygosity with increasing distance from putative geographic origins. The color of a point indicates a correlation coefficient r between expected heterozygosity and geographic distance from the point. Geographic coordinates and distances between points were obtained as in Figure 7. Excluding points in Iceland and Greenland, all points in the region shown were considered as possible origins, provided that they were both on land and on a lattice of latitudes and longitudes described by Ramachandran et al. (2005). Among the points shown, the smallest value of r (−0.932) is observed at 1.43°N 20°E.