\begin{table}%t1
\caption{\label{table:obs}Observations of M~81* with the PdBI during 2005.  $\nu_{\rm
    3~mm}$ is the exact frequency used around 3~mm, $\nu_{\rm
    1~mm}$ the one at a wavelength of 1~mm. $N_{\rm Ant}$ is the
    number of antennae, "Config'' refers to the antenna configuration
    used. }
\small      
%\centering
\par
\begin{tabular}{cccccc}     
\hline\hline       
Start [UT] & End [UT] & $\nu_{\rm 3~mm}$ [GHz] &  $\nu_{\rm 1~mm}$ [GHz] & N$_{\rm Ant}$ & Config\\
\hline                    
24-Feb.-2005~01:11 & 24-Feb.-2005~19:45 & 115.3 & 230.5 & 6 & Bp \\
14-Jul.-2005~06:50 & 15-Jul.-2005~13:51 & 80.5 & 241.4 & 5 & D \\
19-Jul.-2005~23:17 & 20-Jul.-2005~16:07 & 86.2 & 218.2 & 5 & D \\
\hline                  
\end{tabular}
\end{table}