Comparison between laboratory spectra of methylamine-containing ices and some Spitzer/IRS spectra of YSOs (with H₂O subtracted) in the 5.4–7.4 μm range (Boogert et al. 2008). Two top panels: spectra of pure methylamine ice at 15 K and the H₂O subtracted CH₃NH₂:H₂O(1:10) ice spectra at 15 K. The vertical dashed lines mark the peak positions of the bands in this mixture. The laboratory spectra are convolved with a Gaussian profile with FWHM corresponding to the Spitzer/IRS resolution (R = 100). Both the laboratory and YSO spectra are normalized with respect to the 1612.9 cm⁻¹ (6.2 μm) feature for better visualization.