The full supplementary materials from this study are not online
yet [UPDATE (May 2): You can read my comments on the suppplement
here]. This seems to be based on a presentation from ASHG 2008.
As I explained in that post, because Europe was settled from the
east, it is expected that genomic diversity (left) would be
higher in SE Europe and lower in SW Europe. However, the
opposite is true. This, coupled with the observation of a higher
degree of haplotype sharing between SW Europe and the Yoruba
HapMap sample, suggests that genomic diversity in the Iberian
peninsula has been enriched directly from Africa. The STRUCTURE
analysis is not quite clear, but clusters centered in Europe,
Mexico, South Asia, East Asia, and Yoruba appear. From the
figure, it appears that a little bit of "South Asian" appears in
Europe, which may represent either a Gypsy element, or the more
general "light blue" element which appeared in Li et al. Figure
B, shows variability of Mexicans, who are mainly a European-
Amerindian mix. Figure