\begin{table}%t1
\caption{\label{obstab} All observations obtained for this investigation 
listed with
their date, the telescope/instrument combination, the used grism and 
slit width, and the exposure time.}
\small%\centering
\par
\begin{tabular}{c c c c}
\hline
\hline
Date & Telescope/Instrument & Grism/Slit & Exp. time [s] \\
\hline
 \noalign{\smallskip}
2003-09-26 & 3.6~m/EFOSC2 & Gr\#4/1.0$''$ & 1800 \\
2004-11-19 & 3.6~m/EFOSC2 & Gr\#11/1.0$''$ & $3\times 900$ \\
\hline
\end{tabular}
\end{table}