Fig. 6.

Depression in the effective population size as a function of $Ns$, $\beta$, and $L=1/s$. Points are estimates from the average behavior in simulations, whereas the solid lines map the expected behavior based on Eq. 11. As noted in the text, $\beta$ is varied by keeping the deleterious mutation rate $u_{10}$ constant (although varying at each population size) and modifying $u_{01}$.