Dust-to-gas mass ratio models. a) Emitting region water column density comprises 15−85% of the radially and vertically integrated flux. Vertical dotted green lines distinguish the reservoirs. b) Total water column densities as a function of radius. c) Average extension of the line emitting region that comprises 50% of the line flux radially and vertically for 12.407 μm. d) Average extension of the line emitting region for 538.29 μm (50% of radially and vertically integrated flux). e) Theoretical Spitzer SH/LH modules spectra (R = 600) for this model series, continuum subtracted and arbitrarily shifted. f) Theoretical Spitzer SH/LH modules spectra (R = 600) for this model series. g) Spitzer line fluxes with sensitivity limits (green dotted lines) for Spitzer/IRS, JWST/MIRI. h) Radiation field and optical extinction in the line emitting regions of 12.407 μm and 538.29 μm.