Observed CH₃OH C–H symmetric stretching modes compared to select laboratory data. The peaks were extracted from the 3.5 µm absorption complexes via a local continuum fit using baseline points in the range ~3.47–3.50 and 3.60–3.62 µm (Fig. 3). It is clear from these comparisons that cold, amorphous, and relatively pure CH₃OH is the major contributor to this feature. Left: observed peaks vs. laboratory spectra of CH₃OH ice in various chemical environments. All spectra were collected at 15 K except the CH₃OH:CO₂ spectrum, which was collected at 10 K (Ehrenfreund et al. 1999). Right: observed peaks vs. laboratory spectra of pure CH₃OH ice at various temperatures.