Averaged spectrum of the H2CO (312–211) line at 225.698 GHz toward comet C/2001 Q4 (NEAT) observed on UT 8.12 May 2004 with the AOSA (thick blue line), AOSB (thin red line), and CTSB (black 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 1-σ rms noise 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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