Fig. 1.

Cluster size versus frequency plot. The log₁₀ of the cluster size (logCt) (i.e. number of sequences in each cluster) plotted against the log₁₀ of the frequency of cluster membership sizes (i.e. the frequency of clusters that contained n sequences, where n is the cluster membership size) found among all mock community samples. Plots of all mock community data (a), data with cross-sample singletons removed (b), and data with both cross-sample singletons and doubletons removed (c) are shown. Red line regression line, blue line lowess fit line, SE standard error, r² coefficient of determination