The overall size of the RAS and the boundaries between the Inactive-RAS1, RAS1-RAS3, and RAS3-Secondary spaces were determined based on the presence of relatively large energy gaps, while also considering the memory limitations of the computational system. The employed orbital spaces were as follows: 12 active electrons, 64 frozen core orbitals, 30 inactive orbitals, 12 RAS1 orbitals, 0 RAS2 orbitals, 18 RAS3 orbitals, 858 secondary orbitals, and a virtual cut of 444 orbitals.