Averaged spectrum of the CO (2–1) line at 230.538 GHz toward comet C/2002 T7 (LINEAR) observed on UT 9.67 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 rest frame. The rms noise level measured with respect to the zero reference level is shown by the blue, red, and gray bars to the right of the figure for AOSA, AOSB, and CTSB, respectively.
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