\begin{table}%t2
\caption{Parameters of the calibrators used for estimating the
  transfer function. \label{tab:2}}
%\centerline
 {\begin{tabular}{ccccc}
\hline\hline
Name & Spectral & Diameter & Flux dens. & Night$^a$\\
 & type & [mas] & [Jy $@$12~$\mu$m] & \\
\hline
HD~107446 & K3.5III &4.42~$\pm$~0.03& 22.0 & 4 \\
HD~109379 & G5II & 3.25~$\pm$~0.02 & 15.1 & 1\\  
HD~123139 & K0IIIb & 5.34~$\pm$~0.03 &36.4& 3\\
HD~134505 &G8III& 2.50 ~$\pm$~0.01& 8.4 & 4 \\
HD~142804 &M1III & 2.79~$\pm$~0.04& 8.0& 7\\
HD~152820 &K5III & 2.62~$\pm$~0.01&7.5& 3, 4\\
HD~160668 &K5III & 2.28~$\pm$~0.01 & 5.7 & 3, 5\\
HD~165135 &K0III & 3.48~$\pm$~0.02 & 15.5 & 1--7\\
HD~169767 &G9III & 2.16~$\pm$~0.01 & 5.9 & 3 \\
HD~169916 &K1IIIb & 4.00~$\pm$~0.03 &20.1 & 4 \\
HD~173484 &M4III & 3.43~$\pm$~0.04 & 11.9& 5, 6\\
HD~177716 &K1IIIb & 3.76~$\pm$~0.03& 17.1& 2\\
HD~178345 &K0II & 2.49~$\pm$~0.01 & 7.6& 5--7 \\
HD~188512 &G8IV & 2.07~$\pm$~0.01 & 5.9& 1--3\\
HD~192947 &G6/G8III & 2.33~$\pm$~0.02 &7.5& 1\\
HD~213009 &G7III & 2.08~$\pm$~0.02 & 5.9 & 5 \\
HD~218594 &K1III & 3.18~$\pm$~0.02 & 12.4& 3 \\
HD~220704 &K4III & 3.45~$\pm$~0.02 & 13.2 & 7 \\
\hline
\end{tabular}}
\par
\smallskip
$^a$ {The night in which the  calibrator was used.}
\end{table}