Resolution:
## Figure 4.
The . The number of specific genes is plotted as a function of the number (n) of strains
sequentially added (see Materials and methods). For each n, points are the values
obtained for the different strain combinations; red symbols are the average of these
values, and error bars represent standard deviations. The superimposed line is a fit
with a decaying power law S. pneumoniae pan-genome according to the power law modely = A/n^{B}. The fit parameters are A = 295 ± 117 and B = 1.0 ± 0.15.
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