\begin{table}%t1
%\centering
\par
      \caption{Major regular satellites radii, densities, and per mass ice/rock ratios
      derived from Brown et~al. (\cite{Brown91}).\label{tab1}}
         \begin{tabular}[]{llll}
	    \hline
            \hline
            \noalign{\smallskip}
             Satellite & $R$~(km)  & $\rho$ (g cm$^{-3}$)  & $I/R$~ratio \\
           \noalign{\smallskip}
            \hline
           \noalign{\smallskip}
            Miranda & $235.8\pm 1.2$ & $1.15\pm 0.15$ & $1.5$ \\
            Ariel & $578.9\pm1.1$ & $1.56\pm0.09$ & 0.67--1    \\
            Umbriel & $584.7\pm4.0$ & $1.52\pm0.11$ & 0.67--1  \\
	    Titania & $788.9\pm2.8$ & $1.70\pm0.05$ & 0.67--1  \\
	    Oberon & $761.4\pm3.0$ & $1.64\pm0.06$ & 0.67--1   \\
            \hline
         \end{tabular}
\end{table}