Effelsberg (in black, spectral resolution δv of 0.1 kms-1) and e-Merlin (in blue, δv = 0.1 kms-1, the apparent absorption near –63.5 kms-1 is attributed to e-MERLIN residual sidelobes, see Sect. 3.3) spectra of the 616−523 transition of ortho-H2O at 22 GHz toward NGC 7538-IRS1 plotted over the SOFIA (δv = 1.1 kms-1) spectrum of the o-H2O 82,7−73,4 line at 1296.41106 GHz (in red).
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