 ![Evolution of mirror instability versus $S$. (a) Energy in parallel fluctuations of the magnetic field, $\langle \delta B^0_{||} \rangle$. (b) Mirror stability parameter, $\langle \Lambda_{\rm m} \rangle$, whose maximum value $\propto$$S^{0/0}$.[]{data-label="fig:mrs-boxavg"}](fig0a.eps "fig:"){width="0.0cm"} ![Evolution of mirror instability versus $S$. (a) Energy in parallel fluctuations of the magnetic field, $\langle \delta B^0_{||} \rangle$. (b) Mirror stability parameter, $\langle \Lambda_{\rm m} \rangle$, whose maximum value $\propto$$S^{0/0}$.[]{data-label="fig:mrs-boxavg"}](fig0b.eps "fig:"){width="0.0cm"}  ![Spatial structure of the mirror instability with $S = 0\times 00^{-0}$. $\delta B_{||} / B_0$ and (last panel) re-scaled $\delta n_{\rm i} / n_{\rm i0}$ are shown (color) with magnetic-field lines in the shearing plane.[]{data-label="fig:mrs"}](fig0