\begin{table}%t1
\caption{\label{runs}Observing logs of photometric runs.}
%\centerline
 {\begin{tabular}{crc}
\hline\hline
Date-obs. & $n$ & Configuration \\ 
 \hline 
2002, Dec. 12--14 & 22  &   Tek+2.15-m, CASLEO \\ 
2004, Jan. 6     & 33  &   Roper+2.15-m, CASLEO \\
2004, Feb. 1--4   & 272 &   Tek+2.15-m, CASLEO \\
2004, May 19--30 & 213 &   Roper+2.15-m, CASLEO \\ 
2005, Jan. 24--27 & 600 &   Roper+2.15-m, CASLEO \\
2006, Feb. 8--14  &  74 &   Tek+0.9-m, CTIO \\
\hline 
\end{tabular}}
\par
\smallskip
$n$: Number of images acquired.
\end{table}