Fig. B.1.
Sum of the production rates of FeI and NiI as a function of the CO production rate for 2I/Borisov, compared to the values measured by Manfroid et al. (2021) for a sample of Solar System comets (JFC, OCC, and HTC). The black line represents the best correlation for Solar System comets from Manfroid et al. (2021) (excluding C/2016 R2). The JFC located below the trend is 9P/Tempel 1.
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