Fig 5. Eigen-analysis of genetic principle components. For the starting generation and generation 1-3, 4-6, and 7-9 of the low (top) and high (bottom) lines, the posterior mode of the correlation between each of the pheromone ratios and the first and second principle components is shown by the direction and size of the arrows. The genetic variance explained by PC1 and PC2 is indicated on the axes.