Blast-wave and reverse shock velocities (vb and vr, respectively) as a function of the parameter α. The reverse shock velocity (right y-axis, in units of 103 km s-1) is calculated in the frame of the unshocked ejecta ahead of it. We assume that after the reverse shock has entered the ejecta core (α< 0.75), its velocity remains constant and equal to the value for (Eq. (32), see text). For each value of α, the curve for vb (left y-axis, in units of 104 km s-1) provides the velocity of the blast-wave shock at the moment when the reverse shock hits a layer α of the ejecta. Vertical line as in Fig. 1.
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