Scatterplot of the 2 top principal components, for different values of the MAF. The range of MAF of the 9000 SNVs used is spelled out below each panel; also, the numbers in parenthesis match the vertical lines in Figure 1. The colors are based on the clusters that appear in panes (7) and (8). Other panels mix these colors, so the cluster information is lost. Notice that only 2 components are used to facilitate visualization; other components also contain information.