\begin{table}%T1
	\caption{Log-book of Giraffe/FLAMES observations.  Columns 1--4 give the
	observation date, original name associated with each observing block,
	exposure time, and grating used for each exposure, respectively.}
	\label{logbook}
%\centering
 \small                         % used for centering table
\begin{tabular}{c c c c}        % centered columns (4 columns)
\hline\hline 	
Obs. & Exp.   & Exp. Time &Grating\\
Date     &  Name      & (s) & \\
\hline
04/03/2004 & M1-Li-a &2700&HR15\\
04/03/2004 & M2-Li-a &2700&HR15\\
04/03/2004 & M2-Li-c &2700&HR15\\
04/20/2004 & M1-ha   &2700&HR14\\
05/02/2004 & M1-Li-b &2700&HR15\\
05/02/2004 & M2-ha-a &2700&HR14\\
05/02/2004 & M2-ha-b &2700&HR14\\
05/20/2004 & M2-ha-c &2700&HR14\\
\hline                                   %inserts single line
\end{tabular}
\end{table}