As compared to the large-r 0 spectrum in Fig. , the small-η spectrum in Fig. exhibits a smaller region of narrow fictitious peaks. The parameter η determines the strength of the CAP and its smaller value in Fig. as compared to Fig. (with r 0 = 9.524 bohr in both cases) leads to additional peaks above the cutoff energy when η is smaller. In the simulation with the smaller value of η, some of these above-cutoff peaks coincide with excitation energies computed using LR-TDHF theory, indicating that there are resonances that persists and con-tribute to interference in the spectrum that is eliminated at the larger value of η.