Extended Data Fig. 7: Nextera and Twist callset population assignment.

Principal components for a, c, before removing non-European samples for Twist and Nextera respectively. b, d, after removing non-European samples for Twist and Nextera respectively. Principal components generated from the 1000 Genome Project Phase III data and different colors stand for different continental / superpopulations. Study subjects (black dots) were projected onto principal components.