\begin{table}%t1
%\centering
\par
\caption{\label{tab:obs}Log of the observations, obtained  on June 24, 2006, with the UT3-UT4 baseline.} 
\begin{tabular}{c c c c c c }
 \hline
 \hline
Observation  & Projected & Position & Spectral & Resolution \\
 number & length (m)& angle ($^\circ$)& range ($\mu$m) & (mas)\\
 \hline 
% 2.06-2.46 & U1-U3 & 82.4 & 39.8 & 6.2 \\
\# 1 & 59.8 & 99.5 & 2.06--2.46 & 7.1--8.5\\
% ~ & U1-U4 & 122.6 & 65.5 & 4.2 \\
\# 2 & 60.4 & 104.5 & $''$ & 7.0--8.4\\
 \hline    
\end{tabular}
\end{table}