\begin{table}%t1
%\centering
\par
\caption{\label{tab:observations}NTT EFOSC2 observations.}
\begin{tabular}{l l c c c}
\hline
\hline
Mode                               &      Slit              &  Exptime (s) & Nb. Obj.  & Grism\\
\hline 
Spectroscopy                 &   1\arcsec        &   3000              &        24    & 13                \\
Spectrophotometry        &   5\arcsec        &  1800              &        20    & 13                 \\ 
\hline  
\end{tabular}
\end{table}