Additional file 3.

Map of Indian subcontinent depicting the spatial frequency distribution of mtDNA haplogroup R7. Isofrequency maps were generated by using Surfer7 Golden software (Golden Software Inc., Golden, Colorado), following the Kriging procedure. The spread of R7 in India is centered around the AA "heartland" (Bihar, Jharkhand, and Chhattisgarh). Dots indicate the sampling locations.

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Chaubey et al. BMC Evolutionary Biology 2008 8:227   doi:10.1186/1471-2148-8-227