\begin{table} %t1
      \caption{Journal of the observations.}
         \label{obs}
         %\centerline
{
\begin{tabular}{lllll}
\hline          
\hline
   &   $\lambda_{\rm C}$  & $\Delta\lambda$  &   & Exp. times$^a$ \\
Filter &    (\AA)  &   (\AA)  & Date (UT) &   (No. of frames$^b$) \\
\hline
\hnii   &    6560             & 75    & 09,12--13/08/2002       & 12~000 (5)\\
\sii    &    6708             & 20    & 09--10,12--13/08/2002    & 12~000 (5)  \\
\oiii   &    5005             & 28    & 11/08/2002, 20/06/2004 & 9600 (4) \\
%Cont blue   &    5470          & 230   & 11/08/2002         & 540  (3) \\
%Cont red    &    6096          & 134   & 09-10,12-13/08/2002& 1080 (6) \\
\hline
\end{tabular}}
\smallskip
$^a$ Total exposure times in s. \\\
$^b$ Number of individual frames. \\\
\end{table}