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The distribution of divergent sites (k) between D. arizonae and sympatric D. mojavensis in 250 bp (left) and 500 bp (right) intergenic blocks. Colinear chromosomes 4 and 5 are shown in black, the inverted chromosomes 2 and 3 in blue and green, respectively. Points are joined for clarity. The expected distributions under the best supported model inferred from the data (Table 3) are shown as dashed lines.
