Average Qatari ancestry. Average proportion of loci assigned to each HGDP population by SupportMix in the three Qatari sub-populations: Arab-Qatari, Persian-Qatari and African-Qatari. The sub-populations were defined as in Hunter-Zinck et al.  using STRUCTURE and correspond to different degrees of admixture with (A) Arab-, (B) Persian- and (C) African-populations. Values are tabulated in additional file 3.