\begin{table}%t2
\caption{\label{tab:log}Log of the observations.}
%\centering
\small
\begin{tabular}{l r@{ } l@{ } l l}
\hline \hline 
Field & \multicolumn{3}{c}{Night}& $t_{\rm exp}$ (s)\\
\hline
NGC~4590 & 6       &May &2002 &$15+60$\\
NGC~5927 & 6       &May &2002 &$60+300$\\
NGC~6171 & 6       &May &2002 &$10+60$\\
NCG~5904 & 3       &May &2003 &$60+300$\\
NGC~6397 & 5       &May &2003 &$60+300$\\
NGC~6528 & 5       &May &2003 &$60+300$\\
NGC~4372 & 24       &May &2003 &$60+300$\\
NGC~6752 & 24       &May &2003 &$60+300$\\[2pt]
\leoi~field~U     & 4       &May &2003 &$2\times2870$ \\
\leoi~field~R     & 20, 21 &Dec. &2003 &$2\times2870$ \\
\leoi~field~D     & 22       & May &2003 &$2\times2870$ \\
\leoi~field~L     & 16, 25 & Jun. &2003  &$2\times2870$  \\
\hline
\end{tabular}
\end{table}