In Fig. , we continue the propagation in Fig. , now plotting populations from 105 fs through 145 fs. We emphasize however, that, after 69 fs, the electronic wavefunction is a superposition of adiabatic CIS states. In general, the more states that are populated, and the more relative phases there are to keep track of, the more we expect the OP and MP protocols may differ. Indeed, Fig. shows that the OP and MP protocols differ for dt c = 0.24 fs. That being said, as dt c decreases, the population dynamics following the OP protocol converges for dt c = 0.17 fs (see Fig. )); however, the MP protocol does not converge even for dt c = 0.12 fs (see Fig. ). We must now explain this difference in convergence.