Figure 6.

Fixation probability for various population sizes, N, and mutant-fitness averages, $\overline{a}$. The heterogeneity is on resident fitness, using a uniform distribution function, i.e. 1 − Δ_b ≤ b_i ≤ 1 + Δ_b. The fixation probability is normalized to that of uniform population with Δ_b = 0. The shapes (circle/diamond/square) indicate simulation results for various $\overline{a}$, and solid lines are interpolations for N = 10 and $\overline{a}\in \{1,1.1,2\}$.