\begin{table}%t1
\caption{\label{tab:data}Field name and exposure times.}
%\centering
\par
\begin{tabular}{l l}
\hline\hline
Field ID   & Exposure time\\
\hline
GMOS-F1    & 14 $\times$ 30 min \\ 
GMOS-F2    & 14 $\times$ 30 min \\   
GMOS-F3    & 6 $\times$ 30 min  \\  
FORS2-F1   & 12 $\times$ 22 min \\   
FORS2-F2   & 8 $\times$ 22 min  \\  
FORS2-F3   & 2 $\times$ 22 min  \\  
\hline
\end{tabular}
\end{table}