Fig. 1

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Spectrum of comet C/2014 B1 (Schwartz) derived on 2017 January 23 and its step by step processing. Panel a displays the observed spectrum of the comet (black line) and the scaled spectrum of the Sun (red line) taken from Neckel & Labs (1984), panel b is a polynomial fitting of the ratio of the cometary spectrum to the solar spectrum, and panel c is the residual spectrum, namely the emission spectrum after the cometary spectrum has been subtracted.
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