Figure 4.

Contour plot describing determination of window size. The power of the (left) S_f and (right) F_st statistics for various combinations of recombination rate (ρ′ = ρ·w) and mutation rate (μ′ = μ·w). In both cases, the selection pressure was 0.08 (strong), and thresholds were defined by a 1% false positive rate, as described in Section 2.5. The black line represents the range of possible values caused by varying the window size in Drosophila. The black circle represents the 50-kbp window size ultimately chosen, which shows high (≥95%) power for both S_f and F_st.