Abundance maps of CO₂ for the fiducial models with f_ℓ = 0.9. The left panel depicts the model using the chemical network, and the right panel depicts the model with parameterized abundances. The τ = 1 surface of the dust continuum at 15 μm is indicated with a dashed blue line in all panels. The green and purple contours represent the 70% emitting regions of the ¹²CO₂ and ¹³CO₂ ν₂ = 1–0 Q(20) lines, respectively, and the pink contours represent the 70% emitting region of the H₂O 11_3,9−10_0,10 (2438 K) line.