From the above analysis, we can summarize that the dependence of the vertical excitation energy on N state is smaller with XMS and RMS than with XDW, while the dependence of the MECI energy is small when using XDW and RMS since the zeroth-order Hamiltonian is mostly described using the crossing states. Thus, these results suggest that the energetics predicted by RMS are the least sensitive to N state and that this variant is a sensible choice when averaging over many states. At last, we shall note that the dependence of the XDW energy with respect to N state is likely to change for different values of ζ. predicted the same trend as in this SA-CASSCF calculation, such that dynamic electron correlation may play an important role in the geometry optimization for this particular system.