\begin{table}%t2
      \caption{Corrections for source confusion estimated from simulation.}\label{tab2}
  %\centerline
{
     \begin{tabular}{rrrrrrrrr}
\hline \hline  
 \multicolumn{3}{c}{Flux bin} & 
 & \multicolumn{2}{c}{Flux bias$^a$} & 
 & \multicolumn{2}{c}{Detection rate$^b$}\\
 \cline{5-6} \cline{8-9} 
 \multicolumn{3}{c}{(mJy)} & & C\_90 & C\_160 & & C\_90 & C\_160 \\
\hline 
  \multicolumn{3}{r}{~~~--400}&   
 & 1.00 $\pm$ 0.02  & 1.00 $\pm$ 0.04 & & 1.00 $\pm$ 0.02 & 1.00 $\pm$ 0.07\\
 \multicolumn{3}{r}{400--283}  &
  & 1.05 $\pm$ 0.02 & 1.07 $\pm$ 0.04 & & 1.00 $\pm$ 0.02 & 0.90 $\pm$ 0.07\\
 \multicolumn{3}{r}{283--200} & 
  & 1.13 $\pm$ 0.02 & 1.31 $\pm$ 0.07 & & 0.94 $\pm$ 0.02 & 0.64 $\pm$ 0.07 \\
 \multicolumn{3}{r}{200--141} &
  & 1.34 $\pm$ 0.03 &                 & & 0.81 $\pm$ 0.03 &     \\
 \multicolumn{3}{r}{141--100} & 
  & 1.78  $\pm$ 0.06 &                & & 0.30 $\pm$ 0.04 &  \\
 \hline        
\end{tabular}}
\medskip
$^{a}$ Flux bias defined as $S_{\rm measured}/S_{\rm given}$, 
     where $S_{\rm measured}$ and $S_{\rm given}$ are measured and given flux 
     densities in the  simulations.\\
$^{b}$ Detection rate defined as $N_{\rm detected}/N_{\rm 
     given}$, where $N_{\rm detected}$ and $N_{\rm given}$ denote detected 
     and given numbers of sources in the  simulations.
   \end{table}