\begin{table}%t1
\caption{Journal of observations.}\label{obs}
%\centerline
{
\begin{tabular}{ccccc}
\hline
\hline
 Date &   $t_{\rm exp}$ & No.$^a$    & Coverage   &  $S/N$ \\
 d/m/y &  (h)           &       &    \AA    &  \\
\hline
  3, 5--7, 14/2/2001 & 11 & 7  & 3050--3870 & \\
                 &       & 7  & 4780--5760; 5843--6814 & 45--20 \\
 18, 19/3/2001    & 3 & 2  & 3740--4983 & \\ 
                 &       & 2  & 6714--8529; 8677--10000 & 30--15 \\
\hline
\end{tabular}}
\medskip
$^a$ In the third column we give the number of single frames.
\end{table}