Fig. 13
H2O/CO column density ratio as a function of kinetic gas temperature for three H2O optical depths, τ = 1, 10 and 25 (CO is assumed to be optically thin in all cases). Contours are for intensity ratios of H2O 110–101/CO 3–2. The top panel shows the ratio for a density of nH = 105 cm-3 while the bottom panel is for a density of 106 cm-3.
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