Spatial distribution of haplogroup M1 and U6, with languages’ phyla. Frequency maps were obtained using Surfer 8 (Golden Software, Inc.). The Kriging procedure was used and the dataset was congregated with existing ones  and updated with the present study, as well as the data in [27,28]. Figure 1a: frequency map for haplogroup M1. Figure 1b: frequency map for haplogroup U6. Red dots indicate the populations geographic locations.
Pennarun et al. BMC Evolutionary Biology 2012 12:234 doi:10.1186/1471-2148-12-234