HIFI spectra of HO/HO (left) and HO (right) lines (in black), with the continuum for NGC 7538-IRS1 pointed position. The best-fit model is shown as a red line over the spectra (χin(H2O) = 8 × 10-6 and χout(H2O) = 4 × 10-8). The model adopting the SOFIA water inner abundance (5.2 × 10-5) is shown as a blue line above the spectra. Vertical dotted lines indicate the VLSR (–57.4 kms-1 from the line modeling). The spectra have been smoothed to 0.2 kms-1, and the continuum is divided by a factor of two.
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