are counterpoise-corrected except for some results in Section III E, where we examine the impact of this correction on the DLPNO errors. Even in large basis sets, counterpoise correction can have a significant impact on ∆E, especially for large molecules. The resolution-of-identity (RI) approximation is applied to all MP2 calculations but is not employed at the self-consistent field (SCF) level. CCSD(T) calculations use either the noniterative (semicanonical) triples correction, which is sometimes denoted "T 0 ", or else the iterative "T 1 " algorithm that is based on triples natural orbitals. All calculations were performed using ORCA, 31 v. 4.2.1, except for the large dimer complexes using the Karlsruhe basis sets for which ORCA v. 5.0.3 was used.