\begin{table}
%\begin{center}
\par
\caption{The $\mu$ and $\nu$ rings radii.}\label{T-rings}
\begin{tabular}{lcccc} \hline\hline
Ring & Inner edge & Outer edge & Peak radius & Width \\
 & (km) & (km) & (km) & (km)\\ \hline
$\mu$ & 86~000 & 103~000 & 97~700 & 17~000 \\
$\nu$ & 66~100 & 69~900 & 67~300 & 3800 \\
\hline
\end{tabular}
%\end{center}
\par
\end{table}