Temporal evolution of the Doppler velocity of prominent ions. Velocity measurements of SN 2007on (black squares) and SN 2011iv (red circles) are compared to measurements of SN 1986G, SN 1991bg, and iPTF 13ebh (colour coded as in Fig. B.1). The yellow shaded areas correspond to the average velocities measured from a large set of normal SNe Ia (Folatelli et al. 2013).
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