Zoom-in of the Spitzer spectra for our targets (from the PI: Audard program). The colors of the different modules are black (SH), red (LH), green (SL), and blue (LL). The top three targets (and possibly HH 381 IRS) show evidence of H₂O and HCOOH ice at ≈6 μm, CH₃OH and NH at ≈ 6.8 μm, CH₄ at ≈ 7.7 μm, and NH₃ at 8.5−9 μm. In addition, all targets except BRAN 76 and V733 Cep show absorption by CO₂ ice at 15 μm.