Relationships between levels of taxon coverage and relative ID error.

Regression (see Figures 3a, b, c) was fitted according to the linear model y = a+bx and THRK2P_0.05 (i.e. the ad hoc threshold corresponding to a relative ID error <0.05) calculated. Goodness-of-fit is indicated by values of R close to 1.00 and by the statistical significance of (1) F-test of the overall fit (1 and 25 degrees of freedom), (2) t-tests of individual parameters. ***: p<0.001, regression 95% confidence intervals are indicated.