Fig. 7.
Top: spectral evolution of NGC 4490−2011OT1. Bottom-left: spectra of NGC 3437−2011OT1 shown with those of SN 2007bs available in the literature (Van Dyk et al. 2000; Tartaglia et al. 2015). Bottom-right: spectral evolution of UGC 12307−2013OT1 during and after the red light-curve peak. A low S/N SOAR spectrum of UGC 12307−2013OT1 obtained on 2013 August 26 is shown for completeness.
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