\begin{table}%t1
%\centering
\par
\caption{\label{obstab} Summary of the observational details.} 
\begin{tabular}{l l l l l}
\hline\hline
 \noalign{\smallskip}
Object & Date & Instrument & Grism/Slit & $t_{\rm Exp}$ [s] \\
 \noalign{\smallskip}
\hline
 \noalign{\smallskip}
V630~Sgr & 2001-07-16 & DFOSC/1.54D & G4/1.5\arcsec\ & 2400 \\
XX~Tau   & 2003-01-06 & EFOSC2/3.6 & G11/2.0\arcsec\ & 2400 \\
V529~Ori & 2003-01-07 & EFOSC2/3.6 & G11/2.0\arcsec\ & 1200 \\
CQ~Vel   & 2003-01-07 & EFOSC2/3.6 & G11/2.0\arcsec\ & 4800 \\
V842~Cen & 2003-05-12 & EMMI/NTT   & G3/1.0\arcsec\  & 9300 \\
\hline
\end{tabular}
\end{table}