\begin{table}%t1
\caption{The mini-halos analyzed in this work and the basic properties of the radio images at 1.4 GHz.}
%\centerline
{
\begin{tabular}{ccccc} 
\hline\hline
Cluster   & $z$ &  kpc/\arcsec     & Beam & $\sigma$\\
          &   &                  &      & mJy/beam \\
\hline
A1835      &   0.2532    & 3.91 & 53\arcsec~$\times$~53\arcsec & 0.025  \\
A2029      &   0.0765    & 1.43 & 53\arcsec~$\times$~53\arcsec & 0.031  \\
Ophiuchus  &   0.028     & 0.55 & 92\arcsec~$\times$~92\arcsec & 0.16   \\ 
\hline
\end{tabular}}
\medskip
\par
Column 3: Angular to linear size conversion factor;
Col. 4: \textit{FWHM} beam of the radio images; 
Col. 5: image sensitivity.
\label{tab1}
\end{table}