Figure 4.

Coalescence probability as a function of time for a sample of size two. In both left and right, μ = 10⁻⁸, s = 10⁻³, and N = 10⁴. Our theoretical results are shown as solid lines, while the simulations are represented with circles. On the left, r = 4 × 10⁻⁸ and L varies from 5 × 10⁴ to 10⁶, such that ${\mathit{Nse}}^{-U_{\text{d}}/\left(s+R/2\right)}$ varies from 6.2 to 7.8. On the right, L = 10⁶ and r/μ varies from 2 to 8, such that ${\mathit{Nse}}^{-U_{\text{d}}/\left(s+R/2\right)}$ varies from 4.0 to 7.8.