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Fig. 6.


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Spectroscopic comparison between early-time spectra of SN 2020nlb, SN 2015F (Cartier et al. 2017), and SN 2011fe (Nugent et al. 2011). Spectra of SN 2020nlb and SN 2015F taken near B-band maximum are also shown. The positions of the high-velocity and photospheric-velocity components of the Ca II NIR triplet are indicated, as fit from the first SN 2020nlb spectrum (see text). The ‘?’ label on the early SN 2020nlb spectrum is an unidentified feature, which we determine is not likely to be C II (see discussion in text).

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