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Fig. 9


The FWHM(v) of the 6300.304 Å [OI] cometary line (■), the [OI] telluric line (▴), and nearby NH2 cometary lines (●) (km s-1) for one spectrum per comet. The typical errors correspond to the standard deviation (σ) obtained considering all the spectra of comet 8P/Tuttle. We have also checked this error by measuring σ randomly for a few spectra of other comets. For C/2001 Q4, the NH2 cometary lines are missing because no fluorescence lines were detected at such a large heliocentric distance.

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