\begin{table}%T1
%\centering
\par
\caption{Observational correction $C_{\rm obs}$ for the different instruments and
modes (see Sect.~\ref{sec:cobs}).}
\label{tab:cobs}
\begin{tabular}{cccc}
\hline \hline  
& $\ell=0$ & $\ell=1$ & $\ell=2$ \\
\hline 
GOLF & 2.33 & 2.59 & 6.19 \\
%\hline 
BiSON & 2.99 & 3.38 & 8.41 \\
%\hline 
GONG & 3.27 & 3.88 & 10.91 \\
\hline
\end{tabular}
\end{table}