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Signals of Selection in the Top Four PCs of European Populations from the 1000 Genomes Project
The vertical axis is the Di2 statistic following a chi-square (with 1 df) distribution on the basis of the PCA result. For most large Di2 values, it is impossible to calculate the exact corresponding p values (in most cases, p = 0), so we adopted the top values to show the results. The black dashed line indicates the top 0.1% threshold.
