Colorplot of the DAPC of extended HGDP-CEPH data. This colorplot represents the first three principal components (PC) of the DAPC of extended HGDP-CEPH data, using populations as prior clusters. Each dot corresponds to a sampled population. Each principal component is recoded as intensities of a given colour channel of the RGB system: red (first PC), green (second PC), and blue (third PC). These channels are mixed to form colours representing the genetic similarity of populations. The inset indicates the eigenvalues of the analysis, with colour channels used to represent PCs indicated on the corresponding eigenvalues.