The summed FTFC spectra create the E-sum 100 FTFC absorption and emission spectra, black lines in Figure and c, which are broader than their implicit solvent FTFC counterparts, with smoothed-out vibronic features. Overall, the E-sum 100 FTFC absorption lineshape gives good agreement with the experimental absorption lineshape, see Figure , with a slight overestimation of the FWHM value. In contrast, the E-sum 100 FTFC emission lineshape, albeit with a good overall spectral shape for the onset and vibronic tail, is too broad, with an FWHM value that overestimates the experimental value by 0.132 eV. This overestimation is likely due to vibronic contributions, with the vibronic emission spectrum being, on average, overestimated compared to absorption for single snapshots, see Fig. . The E-sum 100 FTFC method also produces an overly large Stokes shift value of 0.588 eV, which is 0.254 eV larger than the experimental value, indicating that the overestimation of the emission spectral width may also be due to environmental contributions.