Averaged spectrum of the HNC (3–2) line at 271.981 GHz toward comet C/2001 Q4 (NEAT) observed on UT 11.95 May 2004 with the AOSA (thick blue line) and AOSB (thin red line). The vertical axis is the calibrated main beam brightness temperature and the horizontal axis is the Doppler velocity in the comet rest frame. The rms noise level measured with respect to the zero reference level is shown by the blue and red bars near the origin of the figure for the AOSA and AOSB backends, respectively.
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