The genome comprises distinct AT-rich and GC-rich regions.

Each sub-plot represents data derived from one of the seven E. festucae Fl1 chromosomes. The black lines represent the proportion of bases in a given 10 kb window that are part of a known repetitive element. An ideogram displaying chromosome structure is placed under each line graph. The blue tracks on each ideogram show the positions of AT-rich regions identified with OcculterCut. Notches represent the putative locations of centromeres. Inset: a scatterplot showing the length and GC-content of AT-rich segments (blue) and the rest of the genome (red); the black diamonds represent the median values for each measurement for each type of region.