Evolution of the U-and V -band absolute magnitudes for two SNe IIb (1993J and 2008ax) and two SNe Ib (2008D and 1999ex). For SN 2008ax, we use the photometry from Taubenberger et al. (2011). We adopt their explosion date MJD 54528.80. We use a total reddening E(B − V) of 0.302 mag and a distance of 8.7 Mpc (Drout et al. 2011). For SN 1999ex, we use the photometric data of Stritzinger et al. (2002). We adopt a reddening E(B − V) of 0.28 mag, a distance of 46.0 Mpc (Drout et al. 2011), and an explosion date of MJD 51480.0 (Stritzinger et al. 2002). See Sect. 2 for details.
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