Figure 2

Core genome analysis of P. aeruginosa . The amount of common nucleotide sequence is plotted as a function of the number of strains sequentially added (n). Gray circles represent core genome size with each possible strain combination of n genomes. Colored squares represent the average core genome size at each n. The continuous curve shows the least-squares fit of an exponential decay function (R² = 0.996). The inset shows the size of the nucleotide pangenome as a function of the number of strains sequentially added. The functions for both the core genome and pangenome continuous best-fit curves were derived as described in Tettelin et al. [32].