Fixation probability of allele 2 ( u
) vs. the selection coefficient s. Black is for u2(s, β), grey is for u2(s, 0). Solid lines are predictions according to Eq. (2) and (3), data points are for simulations with 109 repeats. N = 104, , β = 0.00019, T = 5 × 105. Error bars are standard errors.