Fig. 2.
Black data: continuum-subtracted spectrum of 2I/Borisov on 2019 October 13.2 UT in the region of the C2 (0−0) emission band. Blue theoretical spectrum: C2 emission flux through our aperture for a production rate of Q(C2) = 2.5 × 1024 molec/s at a spectral resolution of Δλ = 1 nm. Red theoretical spectrum: as above for Q(C2) = 6 × 1023 molec/s.
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