FIGURE 1. Origins of samples.
From the following article:
The effect of ancient population bottlenecks on human phenotypic variation
Andrea Manica, William Amos, François Balloux & Tsunehiko Hanihara
Nature 448, 346-348(19 July 2007)
doi:10.1038/nature05951
Map of locations of populations from which male (blue) and female (red) skulls were collected. Locations from which skulls of both sexes were collected are marked in purple.