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Fig. 1


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OSO 20-m HCN 1–0 spectra towards the comets U1, 45P, 2P/Encke, and 41P. The velocity scale is in the reference frame of the comets and the intensity scale is in Tmb. The positions of the three hfs components are marked with red bars. The relative heights of the bars correspond to the statistical weights, gu, in Table 1. The integrated intensity is also shown together with 1σ error or as 1σ- upper limit where applicable.

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