Averaged spectrum of the HCN (3–2) line at 265.886 GHz toward comet C/2001 Q4 (NEAT) observed on UT 7.98 May 2004 with 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 comet nucleus rest frame. The rms noise value on the brightness temperature measured with respect to the zero reference level is shown by the blue, red, and gray bars close to the origin for the AOSA, AOSB, and CTSB backends, respectively. Note the difference in the native spectral resolutions.
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