Table 4: This table indicates the radius of several f-surfaces, for several values of L, $V_{\rm c}$ and $\sigma _{\rm inel}$. We have introduced $L_{10}\equiv L/10$ kpc, $V_{10} \equiv V_{\rm c}/10$ km s-1 and $\sigma _{100}\equiv \sigma /100$ mb.
L(kpc) $V_{\rm c}$ (km s-1) $\sigma _{\rm inel}$ (mb) $R_{50\%}
$(kpc) $R_{90\%}
$(kpc) $R_{99\%}
$(kpc)
$L_{10} \times 10$ 0 0 6.3 $\times L_{10}$ 19 $\times L_{10}$ 34 $\times L_{10}$
$\infty$ $10 \times V_{10}$ 0 4.9/V10 18.6/V10 41/V10
$\infty$ 0 $100\times \sigma_{100}$ $3.7 /
\sigma_{100}$ $30.8 / \sigma_{100}$ $318/ \sigma_{100}$
5 0 0 3.1 9.5 17
5 10 50 2.05 6.8 13.1


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