Fig. 8.
Coalescence of the first five forward shock waves (full lines) in a time-space diagram for Model W (upper panel) and Model H (lower panel) at the innermost 1.5 kpc. Dotted lines remark the reverse shocks. The time is given in units of the SN explosion interval ΔtSN. The reverse shocks (dotted lines) move at smaller speeds and collide with the forward shock, slowing them down.
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