Fig. 6
18OH lines observed in Zw 049.057 with PACS. The black histograms are the observed, continuum-normalized, spectra. Model results from Sect. 3 are also included. The red curve denotes the model for Ccore, which was first constrained using the high-lying H2O lines detected with PACS, but with an added 18OH column that was varied in order to fit the 18OH lines.
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