Continuum-subtracted MIRI spectrum of XUE 10 (black) with overlaid best-fit slab models of the identified carbon dioxide isotopologues, ¹²CO₂ (red), ¹³CO₂ (orange), ¹⁶O¹²C¹⁸O (green), and ¹⁶O¹²C¹⁷O (purple) between 12.93 and 17.6 μm (from top to bottom). The vibrational quantum numbers (v₁v₂v₃) corresponding to the fundamental v₂ Q-branch, and its associated hot bands are labeled for each species. The inset in the bottom panel shows the fiducial LTE slab model of H₂O that matches the observed line luminosity between 17.08 and 17.4 μm. The colored horizontal bars indicate the fit wavelength ranges for CO₂ listed in Table D.1. The spectral uncertainty is indicated in each panel.