Averaged spectrum of the HCN (3–2) line at 265.886 GHz toward comet C/2002 T7 (LINEAR) observed on UT 8.68 (left panel), 9.70 (second panel), and 11.60 (right panel) May 2004 with integration times of 120, 60, and 28 min respectively using the AOSA (thick blue line), AOSB (thin red line), and CTSB (black line) spectrometers. The vertical axis is the calibrated main beam brightness temperature and the horizontal axis is the Doppler velocity in the cometocentric frame. The rms noise level measured with respect to the zero reference level is shown by the blue, red, and gray bars near the plots origin for AOSA, AOSB, and CTSB, respectively.
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