Solid histograms indicate the likelihood distributions for the physical parameters of the two-component model (green and blue for the disk and core component, respectively). (a)–(d) are fitted parameters while (e)–(f) are derived parameters. Dotted histograms show the likelihood distributions of a fit that ignores the 448 GHz H2O line, showing consistent results but a high uncertainty in NH2O and XH2O. The arrows indicate the values of the best model fit, with results for the H2O fluxes and continuum flux densities displayed in Fig. 3.
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