Fig. 12
Schematic representation of the CO (red), the ortho-H2O (blue), and para-H2O (green) abundance profiles. The vertical dashed black line indicates the H2O ice condensation radius. The vertical full black line indicates the location of the OH 1612 MHz maser shell, assuming a distance of 2100 pc. The signal-to-noise of the PACS is too low to trace the drop in H2O vapor abundance (shown here for a freeze-out of ~40%) at the H2O ice condensation radius.
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