Table 2: Stratification parameters and optimal conditions for the onset of instability. $A^*_{\rm max}$ is the highest value of $A^*=\varepsilon A_t+ A_\mu$ that allows for instability; $[AS]_{\rm max}$ the maximum of the product A^*S(A^*) for fixed $\varepsilon A_t/A_\mu$ , obtained at $A^*_{\rm opt}$ , from which one derives the instability threshold for the magnetic field (see text).
$\varepsilon A_t/A_\mu$ $A^*_{\rm max}$ $S(A^*_{\rm max})$ $[AS]_{\rm max}$ $A^*_{\rm opt}$

0 12.928 0 9.829 8.788

0.01 10.249 0.602 9.307 8.138

0.1 6.970 0 .754 6.960 5.885

1 4.000 0.550 3.451 3.171

10 3.125 0.219 2.186 2.087

$\infty$ 3 0 0.728 2.070

**Table 2:** Stratification parameters and optimal conditions for the onset of instability. $A^*_{\rm max}$ is the highest value of $A^*=\varepsilon A_t+ A_\mu$ that allows for instability; $[AS]_{\rm max}$ the maximum of the product A^*S(A^*) for fixed $\varepsilon A_t/A_\mu$ , obtained at $A^*_{\rm opt}$ , from which one derives the instability threshold for the magnetic field (see text).
$\varepsilon A_t/A_\mu$	$A^*_{\rm max}$	$S(A^*_{\rm max})$	$[AS]_{\rm max}$	$A^*_{\rm opt}$
0	12.928	0	9.829	8.788
0.01	10.249	0.602	9.307	8.138
0.1	6.970	0 .754	6.960	5.885
1	4.000	0.550	3.451	3.171
10	3.125	0.219	2.186	2.087
$\infty$	3	0	0.728	2.070

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