Histogram of dispersion distance counts from P. islandicum to P. aerophilum and from T. thermophilus to P. aerophilum. We divide the range of dispersion distance between ortholog pairs into 10 bins on X-axis between P. aerophilum and P. islandicum and between P. aerophilum and T. thermophilus. The lower indexed bin contains shorter dispersion distance of ortholog pairs. The height of the bin represents the frequency of dispersion distance falling into the bin. Using P. aerophilum as the target genome, a black bar represents the frequency of the dispersion distance between genomes P. aerophilum and P. islandicum, and a white bar represents the frequency of dispersion distance between P. aerophilum and T. thermophilus.