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Fig. 2

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CH3OH lines at 157 GHz observed with the IRAM 30-m telescope in comet C/2002 X5 (Kudo-Fujikawa) on 26.5 January 2003. The vertical scale is main-beam brightness temperature. The horizontal scales are the rest frequency (upper scale) or the Doppler velocity in the comet rest-frame, relative to the (60 − 6-1)E line frequency (bottom scale).

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