The 13.6–17.7 μm range of the GM Aur spectrum. The continuum-subtracted JWST-MIRI data (black, top panel) is overlaid with the total modeled emission (red, top panel) from molecules (bottom panel) H₂O (blue) and OH (pink). Slab model fits were also performed for HCN, C₂H₂, ¹²CO₂, ¹³CO₂, and ¹³C¹²CH₂; however, H₂O and OH were the only positive detections, while the remaining species did not match our detection criteria (see Section 3.1). The detected bright H I, H₂, and atomic emission lines are labeled with dashed lines.