Frequency distribution of parameter P on genomic At IRs. Shows the frequency distribution of the exponents of probability of occurrence of base-pair matches (P) in IRs detected from genomic DNA of Arabidopsis thaliana with base thresholds of D
= 59% and P
= 9.99×10-9. The values shown are the exponents of the probability value i.e. the exponent -11 indicates P values from 1.00×10-11 to 9.99×10-11.