Examples of distribution of peaks. Several examples of hexamer analysis against Arabidopsis promoters are shown. The vertical axis indicates the total count of the whole promoter database. Gray and solid lines show raw and average with 15 bin (width of window), respectively. Instead of the promoter database, a set of 3,000 random fragments of 1 kb length from the Arabidopsis genome were used for the occurrence analysis as negative controls (shown as "random genome" in the bottom columns).