Comparison between the IR profile of YSOs and the absorption spectra of the CH₃NH₂:H₂O(1:10) ice at 15 K (top blue curve). All the YSO spectra are normalized in relation to the optical depth at 2800 cm⁻¹ (3.57 μm). The gray lines are the original spectra and the black lines are the smoothed spectra. The smoothing uses a 15-point boxcar, that corresponds to a window of 4–6 cm⁻¹ in the analyzed spectra. The position of the methylamine bands at 2898, 2796, and the feature at 2760 cm⁻¹ are marked with dashed lines.