Study of pseudo-equivalent widths for feature 2 to 7 vs. epoch. The shaded band shows the one sigma contour for the normal SNe Ia in the reference sample. The points show the measurements on the NTT/NOT spectra, where the error bars include both statistical and systematic errors. The different symbols show two categories: spectra identified as of the normal SNe Ia subtype by SNID (SuperNova IDentification; Blondin & Tonry 2007) or spectra identified as SNe Ia but of unknown subtype.
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