at the CCSD(T)-F12b level of theory using the Molpro package. The Molpro default ansatz of 3C(FIX) was used, 51 along with a geminal Slater exponent of 1.0 a -1 0 at all zeta levels. Open-shell calculations were carried out using restricted open-shell Hartree-Fock (ROHF), with the spin-restriction relaxed in the CCSD component, which could be abbreviated as R/UCCSD(T)-F12b. To investigate the effect of the additional diffuse functions on the EAs of the heavy post-d elements, calculations were carried out with both the existing cc-pVnZ-PP-F12 and the newly developed aug-cc-pVnZ-PP-F12 families of OBSs and ABSs. The ABSs used in the fitting of the Coulomb and exchange integrals were def2-QZVPP-JKFit and def2-AQZVPP-JKFit, respectively. Unless otherwise stated, only the valence s and p electrons were correlated.