Distribution of core genes and median pairwise distances.

<p>Median p-distance plotted against genome position, relative to the reference genome, for Sp) <i>S. pneumoniae</i> (ATCC700669, 2.2 Mb); Cj) <i>C. jejuni</i> (NCTC11168, 1.64 Mb); Nm) <i>N. meningitidis</i> (FAM18, 2.19 Mb); Sa) <i>S. aureus</i> (HO5096_0412, 2.83 Mb); and Hp) <i>H. pylori</i> (26695, 1.67 Mb). The length of each line on a genome diagram was scaled according to the maximum p-distance value calculated for that particular bacterial species. The three outer rings mark the 99^th, 95^th and 50^th percentiles. Median p-distances above the 95th percentile were coloured red; median p-distances above zero but less than the 95th percentile were coloured blue. The innermost pair of rings marks the position of genes with a median p-distance of zero.