Comparison of diversity across genomic regions within the four populations. a) Violin plots display average π values in 50 kb windows for centromeres (blue), inversions (yellow), telomeres (red), and the rest of the genome (dark gray). b) Average π in each of the four major inversions. c) Heatmap of inversion frequencies per population for northern (NN), southern (SS), and heterozygote (NS) genotypes.