English: Ancestry inference estimated on the basis of model-based unsupervised clustering for the global dataset. (a) Ancestry plots for two to seven ancestral populations (K=2 to K=7) for all 26 populations included in the analysis. (b) Cross-validation (blue) and log-likelihood (black) for the ancestry analysis with K=2 to K=10. For K=4, the majority of Iberian ancestry is derived from a component largely present in European populations (orange), while a Northern/Central European component (blue) is the second most relevant component in Iberian populations. A component associated with North Africa ancestry (yellow) was found as the third most relevant in Iberians and the sub-Saharan component (red) is only present at a vestigial level.