PCA scatter plots of the simulated data set.

<p>Projection of individuals from 5 populations onto a two dimensional (X,Y) subspace of four PCs. The panels <b>A</b> to <b>D</b> show pair wise comparison of PC combinations. Each individual is represented by a datum point. Each sub-population is denoted by a separate colour. The variation captured by each PC is indicated in parenthesis next to the axis label.</p>