\begin{table}%T4
%\centering
\par
\caption{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.}
     \label{big_table}
     \begin{tabular}{cccccc}   \hline\hline
	$L$(kpc) & $V_{\rm c}$ (km~s$^{-1}$) & $\sigma_{\rm inel}$ (mb) &
	$R_{50\%}
	$(kpc)
	& $R_{90\%}
	$(kpc) & $R_{99\%}
	$(kpc) \\
	\hline
	$L_{10} \times 10$  & 0 & 0 & 6.3 $\times L_{10}$ & 19
	$\times L_{10}$ &
	34 $\times L_{10}$\\
	$\infty$ & $10 \times V_{10}$ & 0 & $4.9/V_{10}$ & $18.6/V_{10}$ &
	$41/V_{10}$\\
	$\infty$ & 0 & $100\times \sigma_{100}$ & $3.7 /
	\sigma_{100}$ & $30.8 / \sigma_{100}$ & $318/ \sigma_{100}$\\
	\hline
	$5$ & 0 & 0 & 3.1 & 9.5 & 17\\
	$5$ & 10 & 50 & 2.05 & 6.8 & 13.1\\
	\hline
     \end{tabular}
     \end{table}