Table 1 depicts elements of user input: transition dipole moments of the molecular fragments used by PyFREC for calculation of electric couplings with Eq. 9. Calculation of the electrostatic screening factors1-3, 6, 23, 24 for this calculation is approximated as: s=1/n2=0.56 where n=1.34 is the refractive index of acetonitrile.26 The spectral overlap (J=3.14×10-4 cm) is based on the empirical spectra.4