The conventional understanding of loose, normal, and tight thresholds is different for CCSD(T) than it is for MP2, and thresholds suggested as "loose" for MP2 calculations are comparable to what is considered "tight" for CCSD(T). 94,95 DLPNO-CCSD(T) calculations for the S66 and L7 data sets, using either the semi-canonical T 0 or iterative T 1 approximations, suggest that DLPNO errors at the CCSD(T) level are larger than those at the RI-MP2 level, even when the same set of PNO thresholds is used for both calculations. Moreover, whereas T CutPNO = 10 -7 is suggested as the "normal" threshold for DLPNO-CCSD(T) calculations, 94 that choice affords errors of 2-6 kcal/mol for large π-stacked complexes in the L7 data set, specifically those that involve the highly conjugated coronene and circumcoronene molecules.