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Fig. 8

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H2O 179 μm/557 GHz ratio vs. the H2O 179 μm intensity (expressed in erg s-1 cm-2 sr-1). Theoretical LVG predictions are plotted for volume densities of 105, 106 and 107 cm-3, and for kinetic temperatures of 300 K (dashed line) and 500 K (full line). Along each curve the N(o-H2O) column density varies from 1012 to 1016 cm-2 in steps of a factor 10. Open cyan circles refer to intensities measured in a beam of 38′′, equal to the beam size of the 557 GHz observations. Filled red circles plot the unconvolved PACS intensities. The data point for L1448-C is labeled.

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