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Fig. 1

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Upper panel: CH3OH averaged spectrum toward comet C/2001 Q4 (NEAT) acquired on UT 11.03 May 2004 with a 312   min total integration time using the AOSA (thick blue line) and AOSB (thin red line). Lower panel: frequency range covered by the CTSB (black line) with the AOSA (thick blue line) and AOSB (thin red line) spectra. The lower sideband frequency is shown in the horizontal axes and the calibrated main beam brightness temperature in the vertical axes. The CTSB spectrum was resampled to a 190 kHz resolution per channel with a rectangular window function to increase the S/N of the detected lines. Note that a spurious emission feature is present around 241.825 GHz in the AOSA spectrum. The rms noise level in the main brightness temperature is calculated from the background level and is shown by the blue, red, and gray bars on the right of the lower panel for AOSA, AOSB, and CTSB, respectively. Note that the rms in the CTSB spectrum was calculated for the native frequency resolution of 40 kHz.

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