\begin{table}%T1
      \caption{\label{tab:all}The sample of clusters.}
      \small%\centering
\par
         \begin{tabular}{llllllllccc}
            \hline\hline\noalign{\smallskip}
\multicolumn{1}{c}{Name}&
\multicolumn{3}{c}{$\alpha (2000)$}&
\multicolumn{3}{c}{$\delta (2000)$}&
\multicolumn{1}{c}{$z$}&
\multicolumn{1}{c}{\# frames}&
\multicolumn{1}{c}{Area (Mpc$^2$)}&
\multicolumn{1}{c}{seeing ~ ($''$)}\\
\hline
 A~2658 & 23 & 44 & 49 & --12 & 17 & 39 & 0.185 & 1 & 0.3055   & 0.70 \\
 A~1643 & 12 & 55 & 54 & +44 & 05 & 12 & 0.198 & 2 & 0.6810  & 0.55 \\
 A~1878 & 14 & 12 & 52 & +29 & 14 & 28 & 0.220 & 2 &  0.7894 & 0.70  \\
 A~2111 & 15 & 39 & 40 & +34 & 25 & 27 & 0.229 & 2 & 0.8030  & 0.70 \\
 A~1952 & 14 & 41 & 03 & +28 & 37 & 00 & 0.248 & 2 & 0.7989  & 0.55--0.80\\
\hline
         \end{tabular}
       \end{table}