\begin{table} %T1
%\centering
\small
\caption{Description of the data set used in this work.} 
\label{obs} 
\begin{tabular}{ccccc} 
\hline\hline ID & date & EXP-TIME & FILT & GO\\ 
\hline
%------------------------------------------------------------------------------------------ 
\multicolumn{5}{c}{ first epoch }\\
\hline
\par
   A  &   Apr'97  & 9 $\times$ $\sim$800 s                                                                    & {\it F814W} & 6797 \\
\par
   B  &   Mar'94  & 3 $\times$ $\sim$1000 s $+$ 2100 s $+$ 500 s                  & {\it F814W} & 5092  \\
      &   Mar'94  & 5 $\times$ $\sim$1000 s $+$ 400 s                          & {\it F606W} & 5092  \\
\par
   C  &   Oct'96  & 3000 s $+$ $2\times1900$ s                                 & {\it F814W} & 6802  \\
      &   Oct'96  & 1300 s $+$ 700 s                                         & {\it F814W} & 7203  \\
      &   Oct'96  & 1700 s $+$ 400 s                                         & {\it F606W} & 6802  \\
      &   Oct'96  & 300 s                                                 & {\it F606W} & 7203  \\
\par
   D  &   Apr'95  & 1800 s                                                & {\it F814W} & 5369  \\
      &   Apr'95  &         2 $\times$ 1200 s                               & {\it F814W} & 5370  \\
%%--------------------------------------------------------------------------------------------------------------------------%
\hline
\multicolumn{5}{c}{ later epochs }\\
\hline
\par
   A  &    Mar'03 & 500 s $+$ 260 s                                          & {\it F606W} & 9676 \\
\par
   B  &    Apr'01 & 3 $\times$ 1300 s $+$ 1200 s                               & {\it F814W} & 8656 \\
      &    Apr'01 & 4 $\times$ 1300 s                                       & {\it F606W} & 8656 \\
\par
   C  &    Oct'00 & 1200 s $+$ 7 $\times$ 1300 s                               & {\it F606W} & 8656 \\
      &    Oct'01 & 1200 s $+$ 5 $\times$ 1300 s                               & {\it F814W} & 8656 \\
%
   D  &    Apr'01 & 2 $\times$ 1300 s                                       & {\it F814W} & 8656 \\
%     &    Apr'01 &         6$\times$1200s                               & {\it F606W} & 8656 \\
%------------------------------------------------------------------------------------------
\hline 
\end{tabular} 
\end{table}