\begin{table}%T1
%\centering
\par
\caption{Log of the observations for NGC~2808. Date is UT, and\protect exposure
times are in seconds.}\label{t1}
\begin{tabular}{rccc}
\hline\hline
Grating &Date       &UT$_{\rm beginning}$ &exptime \\
\par
\hline
HR11   & 2004-02-16  & 05:35:52.011  & 3000 \\ 
       & 2004-02-16  & 06:26:45.660  & 3000 \\ 
       & 2004-02-17  & 05:23:11.985  & 2850 \\ 
       & 2004-02-17  & 06:11:42.443  & 2850 \\ 
HR13   & 2004-01-12  & 05:36:55.750  & 2850 \\ 
       & 2004-01-12  & 06:25:25.730  & 2850 \\ 
       & 2004-01-18  & 05:56:41.205  & 3000 \\ 
       & 2004-01-18  & 06:47:34.701  & 3000 \\ 
\hline
\end{tabular}
\end{table}