Figure 3

Phylogenetic conservation. Conservation in the three types of intervals arranged by size, measured as the number of bases within conserved elements identified by the PhastCons algorithm per 1,000 base pairs. The y-axis shows the sliding average of the conservation of 100 intervals consecutive in size, while the x-axis shows the average size of the same 100 intervals. This artificially reduces the variance between individual points and is done for illustration only. All reported statistics use the individual values, not these sliding averages.