Panels a)−c): colours of iPTF13z from the P60 telescope, corrected for galactic reddening, shown with filled symbols. Colours obtained from synthetic photometry on spectra from 17 and 193 days are shown as open square symbols. Panel d) shows the pseudo-bolometric light curve (gri) for iPTF13z, with the r-band light curve shown for comparison in panel e) (labelled bumps B1−5). Epochs of the bumps are marked with vertical dashed blue lines.
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