\begin{table}%T5
\par
\caption{\label{photcal}Absolute photometric uncertainty and point source sensitivity.}        
\small
%\centering
\par
\begin{tabular}{c c c c c }    
\hline\hline \noalign{\smallskip}                
Band & Uncertainty\tablefootmark{a} & Point
source\tablefootmark{b} & Scan map\tablefootmark{b} & Parallel\tablefootmark{b}\\
         &                    &    mode                               & [$10'\times15'$] & $[120'\times120']$\\
        &                     & $5\sigma$/1~h         &  $5\sigma$/30~h &$1\sigma$/3~h\\  
\hline                   
   Blue    & $\pm$10\%  &  4.4~mJy    & 3.7~mJy   & 19.8~mJy\\       
   Green &   $\pm$10\%  &  5.1~mJy    & 5.0~mJy   & n.a.\\
   Red    &  $\pm$20\%   &  9.8~mJy   & 9.5~mJy   & 116~mJy\\ 
\hline  
\end{tabular}
\tablefoot{\tablefoottext{a}{Derived from 33, 23 and 51 targets for blue,
green and red point source observations respectively.}\\
\tablefoottext{b}{The noise values quoted in the table are instrument limited for the blue
and green filter. The value for the red filter already contains
confusion noise contributions (see text).}} 
\end{table}