Figure A1.

The SFS $f_{\text{SFS}}(x)/\mu$ when α = 1 for the selective advantage $\sigma =-2,0,2$. $f_{\text{SFS}}(x)$ is obtained by numerically evaluating the exact expression of t(x) in the first line of Equation A.5. As $x\to 0$, f(x) becomes independent of σ. Near x = 1, while the magnitude of f(x) depends on σ, the scaling behavior (slope in the log–log plot) does not. See Equation A.14.