Early spectra of iPTF13bvn at around one week before and after maximum light, compared to other stripped-envelope SNe. Vertical dashed lines show the positions of prominent helium lines, and the dotted line shows the position of high-velocity Hα. The spectra were taken from the Weizmann Interactive Supernova Data Repository (WISeREP; Yaron & Gal-Yam 2012)
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