Fig. 1

Folded spectra for the horizontal polarization mixer (blue line), vertical polarization mixer (red line), and averaged spectrum (black line) of the ortho-water JKaKc (110–101) line at 556.936 GHz acquired with the WBS on UT 1.5 September 2010. The fitted baselines are obtained by masking a (–1, 1) km s-1 window around the rest frequency of the water line and using a linear combination of sine functions. The vertical axis is the calibrated main-beam brightness temperature, the upper horizontal axis is the lower sideband frequency, and the lower horizontal axis shows the Doppler velocity with respect to the nucleus rest frame.
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