\begin{table}%t4
\caption{\label{table4}M~15 surveys.}
%\centering
\par
\begin{tabular}{l c c}
\hline\hline
              & Distance from & Filters\\ 
              & the center    &\\
\hline
Durrell \& Harris (\cite{Durrell1993})    &~$7^\prime$ NW & $B,\ V$\\
De~Marchi \& Paresce (\cite{Marchi1995}) &~$4\farcm6$ NW & $V,\ I$\\
This work                   &~$7^\prime$ NE & $J,\ H$\\
\hline
\end{tabular}
\end{table}