\begin{table}%T3
\caption{\label{colorcor}Photometric colour corrections.}  
\small
%\centering
\par
\begin{tabular}{lcccccc}
\hline \hline \noalign{\smallskip}
BB temp. &  CC\_70 &  CC\_100 & CC\_160 \\
  \hline 
BB (10~000 K) &  1.02   &  1.03    & 1.07  \\
BB (5000 K)  &  1.02   &  1.03    & 1.07  \\
BB (1000 K)  &  1.01   &  1.03    & 1.07  \\
BB (500 K)   &  1.01   &  1.03    & 1.07  \\
BB (250 K)   &  1.01   &  1.02    & 1.06  \\
BB (100 K)   &  0.99   &  1.01    & 1.04  \\
BB (50 K)    &  0.98   &  0.99    & 1.01  \\
BB (20 K)\tablefootmark{a}                   &  1.22   &  1.04    & 0.96  \\
BB (15 K)    &  1.61   &  1.16    & 0.99  \\
BB (10 K)    &  3.65   &  1.71    & 1.18  \\
 \hline  \noalign{\smallskip}
Power law ($\nu^{\beta}$)  &  CC\_70 &  CC\_100 & CC\_160 \\
  \hline 
$\beta = -3.0 $  &  1.04  & 1.04  & 1.06 \\
$\beta = -2.0 $  &  1.02  & 1.01  & 1.02 \\
$\beta = -1.0 $  &  1.00  & 1.00  & 1.00 \\
$\beta =  0.0 $  &  1.00  & 1.00  & 1.00 \\
$\beta =  1.0 $  &  1.00  & 1.01  & 1.03 \\
$\beta =  2.0 $  &  1.02  & 1.03  & 1.08 \\
$\beta =  3.0 $  &  1.04  & 1.07  & 1.14 \\ 
\hline
\end{tabular}\tablefoot{\tablefoottext{a}{Colour corrections for sources with temperatures
                 below 20~K can become quite significant, in particular at 70~$\mu$m.\\
                Photometric reference spectrum:
                 $\nu F_{\nu}=\lambda F_{\lambda}=\rm{const.}$.
                 PACS bolometer reference wavelengths:
                 {70.0, 100.0, 160.0~$\mu$m}. In order to obtain a monochromatic flux density
                  one has to divide the measured
                 and calibrated band flux by the above tabulated values.  } 
}       
\end{table}