Fig. 8
Comparison of the UVES spectra of comets C/2016 R2 at 2.8 au and C/2003 K4 at 2.6 au over the 569.3 to 570.8 nm wavelength range, showing the detection of NH2 lines in K4 (indicated by the vertical red lines, those lines belong to the A(0,10,0)–X(0,0,0) band) and their non-detection in R2. The y-axis has arbitrary units and has been chosen to display both spectra on a similar scale. Most lines detected in R2 in this wavelength range belong to the CO+ (1,2) band.
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