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Fig. 13

image

Shock velocity of iPTF13z assuming it is traced either by the Hβ P Cygni absorption or by the Hα broad FWHM. Explosion is assumed to occur 40 days before discovery. Equations of the fits are given in corresponding colours, for time t given in days. The fits are used to describe the time dependence of the shock velocity, using our spectra.

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