Vertically integrated H₂O column density as a function of radius for the models with f_ℓ = 0.999 with the full chemistry (left panel) and with parameterized abundances (right panel). 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 white plus symbols represent the retrieved N and R_eq values from the three-temperature-component MCMC routine.