\begin{table}%t1
\caption{\label{tab_log}Log of the observations and computed absolute
  visibilities in the continuum.}
\begin{tabular}{cccccccc}
\hline\hline 
Date & Telescopes & Baseline (m)  & PA ($^{\circ}$)& Wavelength ($\mu$m) & Resolution & Calibrator &
Absolute visibility  \\   \hline
10-09-2006 & U1-U2-U4 & 55/82/121 &
34/91/69 & 2.3 & 1500 & HD170499 &
1.0~$\pm$~0.1/0.8~$\pm$~0.05/0.8~$\pm$~0.03\\
05-09-2007 & G1-D0-H0 & 69/60/71 &
326/80/17 & 2.2 & 35 &  HD163955  &
0.8~$\pm$~0.1/0.85~$\pm$~0.1/1.0~$\pm$~0.1\\
05-09-2007 & G1-D0-H0 & 65/46/70 &
345/89/24 & 2.2 & 35 &  HD163955  &
1.0~$\pm$~0.15/1.0~$\pm$~0.1/0.87~$\pm$~0.1\\
06-09-2007 & G1-D0-H0 & 64/31/67 &
0/98/27 & 2.2 & 35 &   HD172051  &
0.85~$\pm$~0.12/0.95~$\pm$~0.1/0.95~$\pm$~0.1\\
\hline 
\end{tabular}
\end{table}