Simulated spectrum compared with merged NIRSpec/MIRI I/F spectra of the leading and trailing hemispheres. The model parameters are: grain sizes D_CO2 = 0.05 µm, D_H2O = 10 µm, D_dark = 1 µm; mass ratio relative to water m_CO2 = 1%; relative areas of the ice:dark terrains = 10:90. Averages NIRSpec/MIRI merged spectra covering the full disk, low and high latitudes regions are shown, as indicated in the inset. NIRSpec and MIRI spectra are corrected from the contribution of thermal emission (see Appendix C). The simulated spectrum cannot explain the 5.9-µm feature.