Fig. 3
Detection of HCN in the observed comets. For each spectrum the red line represents the ±1σ error. The model, Doppler-shifted and affected by transmittance, is plotted below the observed spectra; identified lines are indicated with a star. For comet C/2008 Q3 we omitted the echellograms, since they were too noisy to clearly distinguish the HCN emission lines.
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