A smaller RAS space of (28e,2h,2e; 12o,5o,8o) was also considered and will also be referred to with the shorthand notation RASSCF(28e,25o). With respect to the larger RASSCF(36e,34o) space, four 3d orbitals and five 4d orbitals were excluded from the RAS1 and RAS3 spaces, respectively. The contribution of the HF determinant was again reduced to 27.1% and 31.1% for bare and triphenyl copper corrole, respectively. The two open-shell configurations had slightly larger contributions for both molecules. This smaller RASSCF results in a total wavefunction more similar to the CASSCF(4e,5o) wavefunction (as opposed to the aforementioned larger CAS and RAS spaces). This indicates that including copper 4d orbitals in the active space increases the contribution of the HF determinant. However, the RASPT2(28e,25o) energy splitting is consistent with CASPT2(4e,5o) and CASPT2(14e,15o) calculations, despite these differences in the resulting wavefunctions.