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Fig. 1

Continuum-subtracted SOFIA spectra of the o-H2O 82,7−73,4 line at 1296.41106 GHz toward NGC 7538-IRS1. The vertical dotted line indicates VLSR at –57.4 kms-1. The spectral resolution is 1.129 kms-1. The Gaussian fit is shown in red. The small insert shows the same spectra on a zoomed velocity scale.
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