where N α + N β = N elec and N α = N β for even N elec and N α = N β + 1 for odd N elec . The maximum active space size N Max CSF is set via a specification of a maximum number of active electrons and orbitals (N Max elec ,N Max orb ) whose size is calculated via equation 4; this maximum active space choice is notated as max(N Max elec ,N Max orb ). In this work we calculate results at three choices of max(N Max elec ,N Max orb ): max(8,8) (N Max CSF = 1764), max(10,10) (N Max CSF = 19404), and max (12,12) (N Max CSF = 226512). Following this specification, all orbitals are selected and then the lowest-entropy orbital is successively dropped until the size of the active space calculated via equation 4 is less than or equal to N Max CSF .