However, the LASSI[1,q] approach appears to create significant deadwood in these lowenergy wave functions. We find that 48 of the 182 rootspaces generated at the r = 1 level have zero average weight [w P , Eq. ( )]; these correspond to rootspaces where the charge transfer Fe 2+ → Fe 3+ results in increased S on Fe 2+ center. Additionally, we find that the average excitation number [n KP , Eq. ( )] is zero if the corresponding fragment does not participate in a charge transfer compared to the reference state (Figure ). In other words, for any r = 1 rootspace (cf. Table .2), a "spectator" fragment does not need local excitations. This observation motivates the development of LASSI[r,q CT ], as described in Sec. 2.3. The result for LASSI[1,5 CT ] is quantitatively the same as LASSI [1,5], but with fewer than half the model states of LASSI [1,5].