Mean ancestry proportions and their standard deviations for each population are represented schematically in Figure 4 (see Table S2 also). Considering the peninsula as a single population, the analysis unsurprisingly finds that the highest mean proportion of ancestry corresponds to the Basque parental population. However, this level is only 69.6%, leaving a remarkably high overall mean proportion of North African and Jewish ancestry forming the remainder. Mean North African admixture is 10.6%, with wide geographical variation (Figure 4, Table S2), ranging from zero in Gascony to 21.7% in Northwest Castile. Mean Sephardic Jewish admixture is 19.8%, varying from zero in Minorca to 36.3% in South Portugal (the value in Asturias is unlikely to be reliable, because of small sample size).