\begin{table}%t1
\caption{\label{tab:cluster}General properties of RXC~J2003.5--2323.}
\small%\centerline
 {
\begin{tabular}{ll}
\hline\hline
RA$_{J2000}$  &  20h03m30.4s \\
Dec$_{J2000}$ & $-$23$^{\circ}$23$^{\prime}$05$^{\prime \prime}$ \\
$z$ & 0.317  \\
$L_{\rm X ~ [0.1{-}2.4~keV]}$ & $9.25 \times 10^{44}$ erg s$^{-1}$ (a) \\
$M_{\rm V}$ &  2.05 $\times$ 10$^{15}~M_{\odot}$ (b) \\
$R_{\rm V}$ &  2.75 Mpc (b) \\ 
\hline 
\end{tabular}}
\medskip
Notes to Table~\ref{tab:cluster}: (a) B\"ohringer et~al. (\cite{boeringer04});  (b)~virial Mass~$M_{\rm V}$ and virial radius~$R_{\rm V}$ from the $L_{\rm X ~ [0.1{-}2.4~keV]}-M_{\rm V}$~relation in Cassano et~al. (\cite{cbs06}).
\end{table}