Comparison between extinction-corrected IRAC4 intensities and H2O(1670 GHz) integrated intensities for the sources of Table 3. The formal error bars assume a 40% uncertainty in the IRAC4 intensities (due to the accumulated uncertainty of background subtraction and extinction correction) and a 20% uncertainty in the PACS intensities. The dashed line is a linear correlation that, according to the analysis of Sect. 8.1, corresponds to a constant H2O abundance value of 3 × 10-7.
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