Distribution of fitness effects under various best-fit selective models.

Proportion of mutations falling into each selection interval for each population under each best-fit models. Demographic model parameters are listed in Table 3; selection model parameters are listed in Table 1 except for African American stationary gamma (α = 0.59, β = 37), and European American stationary gamma (α = 0.36, β = 120), and European American simple bottleneck gamma (α = 0.228, β = 5200).