\begin{table}
 \caption{Log of our spectropolarimetric ESPaDOnS and
NARVAL \mbox{observations}. }\label{tab2}
%\begin{flushleft}
%\centerline
{\begin{tabular}{llccc}
 \hline \hline
Star & Date & Julian date& Exposure time& $S/N$ \\
 & dd/mm/yyyy &  &  & \\
\hline
\multicolumn{5}{l}{{\it ESPaDOnS-CFHT observations -- December 2006}}\\
HD 232~862 & 07/12/2006 & 77.937 & 3600 & 307 \\
HD 232~862 & 08/12/2006 & 78.751 & 2800 & 254 \\
HD 232~862 & 09/12/2006 & 79.826 & 2000 & 157 \\
HD 232~862 & 10/12/2006 & 80.818 & 2400 & 278 \\
\\
\multicolumn{5}{l}{{\it NARVAL-TBL observations -- September 2007}} \\
KU Peg & 04/09/2007 & 348.516 & 1200 & 320\\
KU Peg & 05/09/2007 & 349.502 & 1200 & 344\\
HD 21~018 & 05/09/2007 & 349.633 & 800 & 391\\
\hline
\end{tabular}}
%\end{flushleft}
\end{table}