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Fig. 22.
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Velocity versus decay index of Si II at t0+15 days for GRB-SNe and ordinary type Ic-BL SNe from the Gold and Silver samples. Velocities have been computed from the power law (PL) and broken power law (BPL) fits. GRB-SNe show similar velocities to some ordinary type Ic-BL SNe, but evolve more slowly.
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