The present calculations are intended to explore the difference between tight-CCSD(T) thresholds and looseor normal-CCSD(T) thresholds, and to do the same at the RI-MP2 level of theory. That way, we can assess whether conclusions drawn from RI-MP2 calculations can be expected to hold for CCSD(T) calculations as well. However, results in Fig. thresholds, differences with respect to the reference values range up to almost 6 kcal/mol (for the c2c2pd complex) in the CCSD(T) case but are 0.5 kcal/mol for RI-MP2. Moreover, in the CCSD(T) case the DLPNO errors do not always decrease monotonically with T CutPNO . There is precedent for this behavior in the S66 data (see Fig. ), but the energy scale of the fluctuations is much larger in these complexes.