\begin{table}%t7
%\centering
\par
\caption{Redshifts obtained from SDSS.\label{tab:redshiftSDSS}}
\begin{tabular}{ccccc} 
\hline \hline
 Cluster & $\alpha_{\rm 2000}$ & $\delta_{\rm 2000}$ & $z$ & $\delta z$ \\
    & (hh:mm:ss) & ($^{\circ}$:$'$:$''$) &   &  \\
\hline
 Galaxy in V17 & 02:27:45 & 00:59:20 & 0.3965 & 0.0002 \\
 Galaxy in V23 & 02:28:33 & 00:57:18 & 0.3371 & 0.0002 \\
 Galaxy in V30 & 02:26:24 & 01:00:40 & 0.3979 & 0.0002 \\
 Galaxy in V48 & 02:25:23 & 01:08:50 & 0.2674 & 0.0002 \\
\hline
\end{tabular}
\end{table}