It proves useful to examine Table by class of basis set. For the Dunning basis sets, CP correction has a significant effect only at the double-ζ level, where for aug-cc-pVDZ the mean absolute error (MAE) with respect to the DFT/CBS limit is reduced from 0.7 kcal/mol to 0.2 kcal/mol (averaging across functionals) when the CP correction is included. (These statistics exclude the double-hybrid functionals, whose basis-set convergence is quite different and which are considered later.) With the exception of the M06-L functional, this difference of ≈ 0.5 kcal/mol between CP and non-CP interaction energies is larger than the difference between DFT/CBS and CCSD(T)/CBS interaction energies for the same data set (Table ). When the basis set is extended to aug-cc-pVTZ, the CP correction is nearly negligible ( 0.1 kcal/mol), except in the case of M06-L, and for aug-cc-pVQZ it is negligible in all cases. Notably, the CP-corrected aug-cc-pVDZ convergence errors are generally close to the uncorrected aug-cc-pVTZ values, such that results of triple-ζ quality can be obtained at doubleζ cost by applying CP correction.