H2O fluxes and acceptable parameter space of temperature and H2 density. The upper left panel shows that in the H12 model, all far-IR H2O lines expected to be strong are detected (red dots), while those expected to be weak are undetected (black dots). Several lines at ~100 μm were likely undetected because the S/N is degraded in that wavelength region. The upper middle panel shows the acceptable contours for flux ratios of o-H2O 818−707/707−616 (blue), o-H2O 707−616/616−505 (red), and both (purple), for two different column densities. The acceptable parameter space shows the 1σ error bars with a 20% relative flux calibration uncertainty. The lower left panel shows that the non-detection of the o-H2O 550−541 and 652−643 lines relative to o-H2O 616 − 505 line places a limit on the optical depth of the slab. The lower middle panel shows where the flux ratio of o-H2O 845−734 35.669 μm to o-H2O 707−616 71.947 μm is equal to the observed value of 0.07. The lower right panel shows the parameter space (high density and high column density) ruled out by the non-detection of the o-HO 321 − 212 line, for four different temperatures.
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