Group names and numbers of samples collected in Nepal and Bhutan.

1Names of pools are shown in bold print, and names of groups in normal print. Alternative group-names are shown between brackets. For information about the populations included in the pools, see table S2.
2Classification according to van Driem [1]; TB: Tibeto-Burman, IE: Indo-European, IA: Indo-Aryan. For more detailed cluster data, see figure S1.
3Codes used in figures to indicate the populations.