Distribution of π ratios (π_ST/π_HX) and F_ST values calculated in 100-kb windows sliding in 10-kb steps throughout the genome. Data points colored red and blue were identified as selected regions in ST (red dots) and in HX (blue dots), respectively. These points correspond to the 5% left and right tails of the empirical π ratio distribution, where the π ratios are 0.092 and 1.643, respectively (vertical dashed lines), and the 5% right tail of the empirical F_ST distribution, where F_ST is 0.965 (horizontal dashed line).