Comparison of spectra of LSQ13fn with some SNe that show the N iii/C iii/He ii feature. Niemela et al. (1985), in the case of SN 1983K, were the first to report these lines in a SN spectrum. All spectra have been corrected for reddening and recession velocity. The epochs refer to the number of days since peak magnitude. The spectra of the comparison SNe have been scaled in flux to match the continuum level of the LSQ13fn spectra at approximately 7000 Å, and then offset by arbitrary constants, thus allowing direct comparisons between spectra. Panel a): pre-maximum spectra of LSQ13fn and SNe that show the N iii/C iii/He ii feature. Panel b): same as panel a), but with the continuum subtracted from each spectrum. The spectrum of SN 1998S has been convolved with a Gaussian to match the resolution of the LSQ13fn spectrum and aligned in flux. Panel c): spectra at epochs close to peak brightness. Panel d): spectra at >1 month after peak brightness, showing the diversity in the underlying spectral type, in contrast to early-time similarities.
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