Light curves of iPTF13z with power-law fits to the gri band declines (panel a)) and after removal of the power-law fits (panels b)−d)). Filled symbols are used for the power-law fits, × symbols were excluded from the fits. The dashed vertical blue lines indicate the epochs of bump maxima. The bumps, B1−5, are labelled panel b). The black tick marks in panel b) show the epochs of the spectra. Bumps and undulations present in all the filters have been marked with unbroken bold blue lines. Bumps and undulations seen only in the r band are marked with dashed bold blue lines.
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