\begin{table}%t5 \caption{\label{tab:visirobs}The observations of HD69830 and standard star with VISIR on the VLT.} %%\centerline {\small \begin{tabular}{*{3}{c}} \hline\hline Target & Target type & Integration time (s) \\ \hline HD61935 & Cal & 125 \\ HD69830 & Sci & 2100 \\ HD61935 & Cal & 125 \\ HD61935 & Cal & 125 \\ HD69830 & Sci & 2100 \\ HD61935 & Cal & 125\\ \hline \end{tabular}} \medskip Observations were performed under proposal 079.C-0259. All observations were performed using filter~$Q$2 and the small field detector (pixel scale 0\farcs075). \end{table}