Multiplicity-comultiplicity and rank-multiplicity distributions. Some examples of multiplicity-comultiplicity k-distributions and Zipf’s curves  are reported, related to the 6-genomic dictionary of Escherichia coli, Saccharomyces cervisiae, Drosophila melanogaster, and chromosome 19 of Homo sapiens respectively. On the left, we report a given multiplicity on the x-axis, and the number of 6-words having that multiplicity on the y-axis. On the right, we have the corresponding Zipf’s distributions, where the words of the 6-genomic dictionary are reported on the x-axis, according to their decreasing number of occurrences (words with a same number of occurrences are lexicographically ordered), which is on the y-axis, in logarithmic form.
Castellini et al. BMC Genomics 2012 13:485 doi:10.1186/1471-2164-13-485