\begin{table}%t3
\caption{\label{tab:rxcj2003}Properties of the radio halo in RXC~J2003.5--2323.}
\small%\centerline
 {
\begin{tabular}{lc}
\hline\hline
$S_{1400~\rm MHz}$ (mJy) & 35 $\pm$ 2 \\
$S_{610~\rm MHz}$ (mJy) & 97 $\pm$ 5$*$\\
$S_{240~\rm MHz}$ (mJy) & 360 $\pm$ 18 \\
$\alpha$ &  1.32 $\pm$ 0.06 \\
$\log P_{1400~\rm MHz}$ (W Hz$^{-1}$) & 25.09 \\
Linear size (Mpc) & $\sim$1.4 \\
$B^{\prime}_{\rm eq}$ ($\mu$G) & 1.7  \\[2pt]
\hline
\end{tabular}}
\medskip
$*$ VGB07.
\end{table}