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Fig. 4

image

Eleven spectra of SN 2013dx (various colors) and 1998bw (blue only) at comparable rest-frame phases, marked in days with respect to the explosion time of GRB130702A. As in Fig. 3, the SN 2013dx spectra have been smoothed and vertically shifted by 2 × 10-17 erg cm-2 s-1 Å-1, with the earliest one at the top and the latest one, not shifted, at the bottom.

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