\begin{table}%t3
\caption{\label{knownprae}Previously known Praesepe candidates in our survey.}
\small  
%\begin{center}
{         
\begin{tabular}{l c c c l}  
\hline    
\hline        
Object    & $z'$           & $i'-z'$       & $I^{{a}}$ & Reference \\
\hline
WFC~210  & 17.58~$\pm$~0.20 & 1.13~$\pm$~0.28 & 18.02 & Chappelle et al$.$ (\cite{chappelle05}) \\
PHJ~20   & 17.65~$\pm$~0.20 & 1.21~$\pm$~0.28 & 18.48 & Hodgkin et al$.$ (\cite{hodgkin99}) \\ 
WFC~193  & 17.81~$\pm$~0.20 & 1.13~$\pm$~0.28 & 18.21 & Chappelle et al$.$ (\cite{chappelle05}) \\
PHJ~18   & 18.43~$\pm$~0.20 & 1.64~$\pm$~0.28 & 19.63 & Hodgkin et al$.$ (\cite{hodgkin99}) \\ 
WFC~88   & 19.06~$\pm$~0.20 & 1.51~$\pm$~0.29 & 19.83 & Chappelle et al$.$ (\cite{chappelle05}) \\
RPr~1    & 19.71~$\pm$~0.20 & 1.53~$\pm$~0.29 & 21.01 & Magazz\`u et al$.$ (\cite{magazzu98}) \\
WFC~60   & 19.86~$\pm$~0.20 & 1.66~$\pm$~0.28 & 20.79 & Chappelle et al$.$ (\cite{chappelle05}) \\
WFC~24   & 20.32~$\pm$~0.20 & 1.66$\pm$0.29 & 21.19 & Chappelle et al$.$ (\cite{chappelle05}) \\
\hline
\end{tabular}}
\parbox{10cm}{
$^{{a}}$ $I$-band magnitude from the literature.}
%\end{center}
\par
\end{table}