Figure shows the comparison of the electronic spectra of MgG 2+ 4 on five non-symmetric geometries (analogous to Figure ). Across the five geometries, the FEM and ECI methods 4 calculated with the direct method, the FEM, and the six considered variants of ECI (rows) on five geometries (R 1 -R 5 ) sampled from the ground-state vibrational Wigner distribution (columns). Blue dots represent the direct-method results, while red lines represent the FEM and ECI spectra. The pairs of numbers at the top of each panel are RMSD values of excitation energies and oscillator strengths.