Fig. 1
Dependence of the expansion parameter m on time for an SNR with E0 = 1051 erg, n0 = 0.5 cm-3 and P04 = 4 × 104 K cm-3. The solid line corresponds to the case of evolution with the effect of pressure of the ISM, the dashed line for the case without pressure. The vertical lines denote the moments when the shock Mach number Ms = 2 (left) and Ms = 1 (right).
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