Determination of the sizes of fundamental repetitive sequences for the identification of core elements. (A) The distribution of 16,872 repetitive sequences. Four small peaks at 3, 3.6, 4.1, and 6–8.1 kbp are indicated by arrows. (B) The minimal lengths of the extracted repetitive sequences are plotted against the coverage ratio as a red line. The maximum lengths of the repetitive sequences are plotted against the coverage ratio as a blue line. The red line shows that SD13M is covered almost completely (>96%) by the extracted repetitive sequences, and the broken red line shows that 94% of SD13M is covered by repetitive sequences larger than 3 kbp. The broken blue line shows that most of SD13M (>94%) is covered by repetitive sequences smaller than 4.5 kbp. (C) The minimum lengths of the regions shared when two repetitive sequences were aligned are plotted against the number of sequences in which such regions are shared. The broken red line shows that 92% of pairs share 2.7 kbp of consensus sequences, whereas the broken blue line shows that 14% of pairs share 4.5 kbp of consensus sequences.