Spectra of pure methanol and water ices, CH₃OH on top of H₂O ice layers (CH₃OH/H₂O exp. 1 in Table 1) and H₂O–CH₃OH mixture (CH₃OH:H₂O exp. 2 in Table 1) in the full frequency range (a), zoomed-in around the 3.54 μm CH-stretch band (b) and zoomed-in around the 9.75 μm CO-stretch band (c). Re-scaling was applied to the spectrum of exp. 2, and in panels b and c the spectra are shifted along the y-axis.