Unassigned contigs are heavily enriched for low sequence coverage. The x-axis is the maximum read coverage per contig, and y-axis is the percentage of contigs in a category. Red bars are unassigned contigs, and blue bars are contigs assigned to an allelic bin.
Small et al. Genome Biology 2007 8:R41 doi:10.1186/gb-2007-8-3-r41