Fig. 4
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Weighted averages of the OH 1665 and 16 657 MHz lines observed at the NRT, normalized to the intensity of the 1667 MHz (Sect. 2.3). The spectra are integrated over specified periods of time, which are indicated above the plots in yymmdd format. The observations are fitted with trapeziums based on the methodology of Bockelée-Morvan et al. (1990).
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