Figure 4.

Marginal i-Ton branch length distributions for n = 4. Analytic predictions under the neutral model (A) and the approximate selection models (B) are compared to the corresponding distribution obtained from 10,000 simulation replicates overlaid as a histogram. The Yule approximation is indicated by solid lines while the dashed lines indicate the star-like approximation. Results for singleton, doubleton, and tripleton branch lengths are shown in blue, green, and red, respectively. The top row shows two distances from the sweep center $\alpha \approx \{0.14,0.069\}$ and $T_a=0.1$. Analogous results for an older sweep at $T_a=0.25$ are shown in the bottom row. Time is measured in units of $2N_e$ generations. Here, $N_e=10,000$, s = 0.05, and $r={10}^{-7}$. Note that the location and size of each point mass (e.g., the tripleton point mass at time t = 0) is reflected in the CDF rather than the PDF (Supplementary Figure S1).