Fig. 9
Modeled intensity ratio of the 557 and 1670 GHz H2O lines over CO 16–15 as a function of the H2O/CO column density ratio, where the H2O column density is both ortho- and para-H2O. The observed ratios are shown as dashed horizontal lines. The black dashed line is the CO 16–15 opacity, and is shown on the same scale as the intensity ratio. Top: subthermal excitation conditions for H2O. Bottom: thermal excitation conditions for H2O.
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