\begin{table}%t3
\caption{Measured mean visibility moduli below and above the
  silicate absorption, centered at 9.8~$\mu$m. 
\label{tab:3}}
%\centerline
 {
\begin{tabular}{ccccc}
\hline \hline
Julian date & PB$^a$& PA$^a$ & \multicolumn{2}{c}{Visibility} \\
&  [m]& [deg E of N] & 8--8.7~$\mu$m & 11.8--13~$\mu$m\\
\hline
\multicolumn{5}{l}{\quad \#1 night: 2004-07-07} \\
2453194.7  & 45.7 & 46 & 0.17 $\pm$ 0.05 & 0.27 $\pm$ 0.04\\
2453194.7  & 42.3 & 52 & 0.20 $\pm$ 0.06 & 0.28 $\pm$ 0.04\\
2453194.8  & 37.0 & 55 & 0.24 $\pm$ 0.07 & 0.34 $\pm$ 0.04\\
2453194.9  & 26.4 & 53 & 0.47 $\pm$ 0.19 & 0.53 $\pm$ 0.10\\
\hline
\multicolumn{5}{l}{\quad \#2 night: 2004-07-08} \\
2453195.5  & 44.9 & 11 & 0.22 $\pm$ 0.06 & 0.32 $\pm$ 0.06\\
2453195.7  & 43.5 & 50 & 0.22 $\pm$ 0.05 & 0.26 $\pm$ 0.04\\
\hline
\multicolumn{5}{l}{\quad \#3 night: 2005-05-25} \\
2453516.6  & 45.8 & 89 & 0.17 $\pm$ 0.03 & 0.25 $\pm$ 0.04\\
\hline    
\multicolumn{5}{l}{\quad \#4 night: 2005-06-23} \\
2453545.5  & 45   & 89 & 0.10 $\pm$ 0.05 & 0.18 $\pm$ 0.05\\
2453545.5  & 46.8 & 90 & 0.11 $\pm$ 0.04 & 0.22 $\pm$ 0.04\\
\hline                                   %inserts single line
\multicolumn{5}{l}{\quad \#5 night: 2005-06-27} \\
2453549.8  & 54   & 139& 0.13 $\pm$ 0.02 & 0.22 $\pm$ 0.03\\
\hline                                   %inserts single line
\multicolumn{5}{l}{\quad \#6 night: 2005-07-20} \\
2453572.5  & 58.6 & 101& 0.10 $\pm$ 0.04 & 0.21 $\pm$ 0.05\\
2453572.7  & 59.6 & 124& 0.08 $\pm$ 0.03 & 0.18 $\pm$ 0.04 \\
\hline                                   %inserts single line
\multicolumn{5}{l}{\quad \#7 night: 2005-08-23} \\
2453606.5  & 62.5 & 112& 0.05 $\pm$ 0.02 & 0.15 $\pm$ 0.04 \\
2453606.6  & 54.9 & 136& 0.05 $\pm$ 0.02 & 0.12 $\pm$ 0.04 \\
\hline
\end{tabular}}
\par
\smallskip
$^a$ {PB and PA stand for projected baseline length and position angle and characterize the interferometric resolution at the time of the \mbox{observation}.}
\end{table}