Figure G1.

Left: The SFS under positive selection $s=0,\hspace{0.17em}0.005,\hspace{0.17em}0.01,\hspace{0.17em}0.02$, $\alpha =1.5$, and $N={10}^6$. Right: The SFS near x = 1. The straight lines are drawn assuming $\mathit{SFS}(x)\propto 1/{(1-x)}^{2-\alpha }$. The slope is almost independent of s.