Fig. 4.

When we plot the measured fixation probabilities against $s$ times the larger effective population size of our two approximations, Eqs. 7 and 9, our data collapse to a master curve. The agreement with our sine wave simulations suggests that we have identified how the fixation varies with $A_0,\mu ,$ and $s$ for this parameter regime. Error bars associated with 2,000 independent realizations are shown. $A_0>2\sqrt{D\mu s}$ for all data points shown, avoiding the crossover to well-mixed behavior seen at high $s$ in Fig. 2. (Inset) When plotted as a function of the quasi-neutral theory only, Eq. 7, we see a departure from the theory at high values of $s$, which motivates the high $s$ approximation given by Eq. 9.