Panel a) comparison between early spectra of SN 1995ad, SN 1996W and SN 2009dd, and those of the interacting SNe 1999em, 2007od and 2009bw, all showing signs of weak early interaction. Panel b) comparison of the same objects during the plateau phase. Panel c) comparison among early spectra of SN 2007pk, with those of other strongly- (SNe 1998S and 2005gl) and weakly-interacting (SN 2007od) SNe. Panel d) comparison of the same objects during the plateau phase. The phase of SN 2005gl has been adopted from Gal-Yam et al. (2007).
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