The nucleotide composition of the whole genome. A) The GC content plotted for windows of 20 kb with a 5 kb step. Horizontal black line indicates GC content average for the genome (59.5 %). B) The GC skew plotted for windows of 20 kb with a 5 kb step. C) The dinucleotide relative abundance difference with respect to the whole genome average, calculated using delta-rho with a non-overlapping window of 5 kb . The scale is identical in all plots. The aromatics island is shown by the gray box.