Baseline-subtracted spectrum (black) and best-fit LTE model (shaded red) for L1448-mm in the 13.2 – 16.2 µm range. At the bottom of each panel, the individual best-fit LTE models of warm H₂O (blue), C₂H₂ (orange), ¹³CCH₂ (brown), HCN (yellow), CO₂ (green), ¹³CO₂ (purple), and C₄H₂ are shown at an arbitrary constant offset. Deep negative absorption features originating from detector artifacts are clipped for clarity.