\begin{table}%t4
\caption{\label{obs_log}Observing log of dates and integration times of the VLT/UVES spectra.}
%\centering
\begin{tabular}{ll}
\hline \hline \noalign{\smallskip}
Date & Integration time (s) \\        
\hline
2008-08-27T02:43:07.087 & 2380  \\
2008-08-27T03:23:35.587 & 2380  \\
2008-09-01T00:03:51.99 & 2380  \\
2008-09-01T00:44:20.386 & 2380  \\
\hline
\end{tabular}
\end{table}