Comparison of SNe 2012eb (blue) and 2013fu (red) to spectra of other GRB SNe (gray) at two different phases, 13.2 and 19.3 days past explosion, respectively. All comparisons are made in the rest frame. The dashed lines connect the approximate minima for the Fe II and Si II features, and the spectra are shown in an expansion velocity sequence from the fastest (SN 2010bh) to the slowest (SN 2006aj). All data are corrected for Galactic extinction along the line of sight. Data references: SN 1998bw: Patat et al. (2001), SN 2003lw: Malesani et al. (2004), SN 2006aj: Pian et al. (2006), SN 2010bh: Bufano et al. (2012), SN 2013dx: D’Elia et al. (2015), SN 2012bz: Schulze et al. (2014). Further data were taken from the Interactive Supernova data REPository (WISeREP; Yaron & Gal-Yam 2012). All spectra were corrected for host reddening, except for that of SN 2003lw.
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