... shock

In the case of a small cloud, the SNR does not evolve significantly during the shock-cloud interaction, and the assumption of a planar shock is justified (see also Klein et al. 1994).

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... respectively

Run HYm30c10 has been derived from run HYm50c10 through the scaling $t \rightarrow t{\cal M}$, $u\rightarrow u/{\cal M}$, $T\rightarrow T/{\cal M}^2$ (where t is the time, u the gas velocity, and T the temperature), with distance, density, and pre-shock pressure left unchanged (the so-called Mach-scaling; Klein et al. 1994, see also Paper I).

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