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Fig. 6
Comparison of the UVES spectra of C/2016 R2 at 2.8 au and C/2003 K4 at 2.6 au over the 429.5 to 432 nm wavelength range, showing the CH lines from the (0,0) band in R2 (indicated by the vertical red lines) and their absence in K4. The y-axis has arbitrary units and has been chosen to display both spectra on a similar scale.
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