Black line: visible spectrum of comet C/2016 R2 (PanSTARRS) obtained by E. Bertrand on 22.80 February 2018 UT (1 h integration) from Vaux-sur-Mer (France). The spectrum was extracted from the central 50 pixels rows. Green filled lines show the simulated CO+ spectrum with respective average g-factors. Blue filled lines indicate the N spectrum fora N/CO+ column density ratio of 0.08. The vertical intensity scale has been normalized. Dotted lines is the sum of N and CO+ synthetic spectra.
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