for the computation of two-electron integrals. However, using the full set of auxiliary basis functions would remove the linear-scaling properties of the algorithm. Fortunately, since all of the integrals computed in DLPNO-CCSD/(T)/T are expressed using localized occupied or virtual subspaces, only a subset of the auxiliary basis functions is required for each pair domain. Following the work of Riplinger et al., we first determine the Mulliken population of electrons of LMO i on each atomic center A, [116]