Temporal evolution of eight pEW spectral indicators. Black squares and red dots correspond to the pEW values of SN 2007on and SN 2011iv, respectively. Additionally, presented are pEW values determined from spectra of the subluminous Type Ia SN 1986G (orange diamond), SN 1991bg (yellow star), and the transitional SN Ia iPTF13ebh (Hsiao et al. 2015, green triangles). The yellow shaded areas corresponds to the average pEW values measured from a large set of normal SNe Ia (Folatelli et al. 2013).
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