\begin{table}%t2
  \caption{Basic observational parameters for all data used: Object name, 
           observing date (in 2005), filter, flux and full width half maximum
           for  standard star (STD) and science observations. As error 
           estimates we use the standard deviation of all contributing beams 
           (see section \ref{data} for details). The {\it FWHM} are the average of 
           all beams of one exposure. All science and corresponding STD 
           exposures were obtained within a maximum airmass difference of 0.15.
           }\label{obs}
  %\centerline
{
    \begin{tabular}{lclccc|lclccc}
      \hline\hline
      Object & Obs. date & Filter$^*$ & Flux [mJy] & 
      \multicolumn{2}{c|}{{\it FWHM} [$\arcsec$]}&
      Object & Obs. date & Filter$^*$ & Flux [mJy] & 
      \multicolumn{2}{c}{{\it FWHM} [$\arcsec$]} 
      \\
      & (MM-DD)&  & & STD & Obj & & (MM-DD) & & & STD & Obj \\
      \hline
      \object{Fairall 9} & 07-21 & SIV & $256 \pm 5$ & 0.32 & 0.35 &
      \object{NGC 4593} & 04-30 & SIV & $331 \pm 29$ & 0.30 & 0.31 \\
      \object{Fairall 9} & 07-21 & NeIIref1 & $330 \pm 18$ & 0.38 & 0.37 &
      \object{NGC 4593} & 04-30 & PAH2ref2 & $335 \pm 26$ & 0.33 & 0.33 \\
      \object{Fairall 9} & 07-21 & NeII & $306 \pm 10$ & 0.40 & 0.37 & 
      \object{NGC 4593} & 04-30 & NeIIref1 & $382 \pm 73$ & 0.34 & 0.36 \\
      \object{Fairall 9} & 07-21 & SIV & $235 \pm 13$ & 0.32 & 0.34 &
      \object{PKS 2048-57} & 06-10 & PAH2ref2 & $883 \pm 53$ & 0.38 & 0.40 
      \\
      \object{NGC 526a} & 07-20 & SIV & $199 \pm 26$ & 0.41 & 0.30 &
      \object{PKS 2048-57} & 06-10 & NeIIref1 & $1040 \pm 64$ & 0.41 & 0.43
      \\
      \object{NGC 526a} & 07-20 & NeIIref1 & $275 \pm 55$ & 0.41 & 0.35 &
      \object{PKS 2048-57} & 06-10 & SIV & $655 \pm 28$ & 0.37 & 0.39 \\
      \object{NGC 526a} & 07-20 & SIV & $199 \pm 22$ & 0.41 & 0.32 &
      \object{PG 2130+099} & 06-10 & PAH2 & $152 \pm 8$ & 0.39 & 0.38 \\
      \object{NGC 3783} & 04-17 & SIV & $568 \pm 46$ & 0.29 & 0.31 &
      \object{PG 2130+099} & 06-10 & SIVref1 & $115 \pm 20$ & 0.35 & 0.36 
      \\
      \object{NGC 3783} & 04-17 & PAH2ref2 & $632 \pm 22$ & 0.34 & 0.35 &
      \object{PG 2130+099} & 06-10 & NeII & $179 \pm 31$ & 0.41 & 0.43 \\
      \object{NGC 3783} & 04-17 & NeIIref1 & $722 \pm 67$ & 0.34 & 0.36 &
      \object{PG 2130+099} & 06-10 & PAH2 & $174 \pm 17$ & 0.39 & 0.40 \\
      \object{NGC 4579} & 04-30 & SIV & $67 \pm 17$ & 0.30 & 0.25 &
      \object{NGC 7314} & 07-20 & SIV & $75 \pm 29$ & 0.40 & 0.36 \\
      \object{NGC 4579} & 04-30 & PAH2ref2 & $69 \pm 14$ & 0.33 & 0.29 &
      \object{NGC 7314} & 07-20 & PAH2 & $75 \pm 22$ & 0.36 & 0.37 \\
      \object{NGC 4579} & 04-30 & NeIIref1 & $61 \pm 21$ &  0.34 & 0.30 &
      \object{NGC 7314} & 07-20 & SIV & $87 \pm 37$ & 0.40 & 0.34 \\
      \object{NGC 4579} & 04-30 & SIV & $64 \pm 12$ & 0.30 & 0.32 & & & &
      & & \\ \hline
    \end{tabular}
 }\medskip
\par
  $^*$ The central wavelengths for the individual filters are 
           $9.82 ~ \mu$m for SIVref1, $10.49 ~ \mu$m for SIV, $11.25 ~ \mu$m
           for PAH, $11.88 ~ \mu$m for PAH2ref2, $12.27 ~ \mu$m for NeIIref1 
           and $12.81 ~ \mu$m for NeII. Their transmission curves are shown in
           the VISIR User's manual at {\tt http://www.eso.org/instruments/visir/}
\end{table}