The length of CpGcluster islands vs. the logarithm of the assigned p-value. It can be seen that no linear correlation exists and that the relation between p-value and length is more complex, e.g. the p-value depends on both the island length and the island density.
Hackenberg et al. BMC Genomics 2010 11:327 doi:10.1186/1471-2164-11-327