Fig. 17.
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Broken power law fits to the Si II velocities of SN2016coi, PTF12gzk, and GRB060218-SN2006aj. All SNe evolve from a similar maximum velocity of 20 000 km/s, initially following a shallow decay before a break at around 18 days. A second break is visible at around 40 days for SN2016coi and PTF12gzk; there is no data beyond 20 days for GRB060218-SN2006aj, so it is not possible to prove or disprove the existence of a second break for this event.
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