The combined OPA, TPA and 3PA spectra are shown in Fig. . Table summarizes the energy values corresponding to the peak intensities: the first and second excited states appear at 2.81 eV and 4.13 eV in OPA, which are halved in TPA to 1.45 and 2.22 eV, respectively. For 3PA, the peak primarily corresponds to the second excited state, as this transition exhibits the highest transition strength across all snapshots, dominating the 3PA spectrum.