Vertically integrated H₂O column density as a function of radius. The solid lines show the total model column density, and the dashed lines show the model column density integrated up to the dust τ = 1 surface at 15 μm. The red, pink, and blue crosses represent the retrieved N and R_eq from the single-temperature slab fits in the 10–14, 13.5–17.5, and 21–24 μm regions. The plus symbols in the left column represent the retrieved N and R_eq values from the three-temperature-component MCMC routine. The left panel depicts the model using the chemical network and the right panel depicts the model with parameterized abundances.