Fig. 1
Averaged spectrum of the two orthogonal polarisations of the H2O line 110–101 at 556.936 GHz towards comet C/2012 S1 (ISON) obtained by Herschel/HIFI on 8.1 March 2013 UT with the HRS spectrometer. The vertical scale is the main-beam brightness temperature. The horizontal scale is the Doppler velocity in the comet rest frame.
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