\begin{table}%t11
 \caption{Source counts after corrections for the detection rate and 
flux bias.}\label{tab11}
%\centerline
{
 \begin{tabular}{rrrrrrrrrrr}
\hline  \hline
\multicolumn{5}{c}{Cumulative counts, $N_{\rm c}$ (sr$^{-1}$)} & 
  & \multicolumn{5}{c}{
  Differential  counts, $\Delta N_{\rm c}/\Delta S_{\rm c}$ (Jy$^{-1}$ sr$^{-1}$)} \\
 \cline{1-5} \cline{7-11} 
\multicolumn{2}{c}{C\_90}      & & \multicolumn{2}{c}{C\_160}    & 
  & \multicolumn{2}{c}{C\_90}     & & \multicolumn{2}{c}{C\_160}   \\
\cline{1-2} \cline{4-5}  \cline{7-8} 
    \cline{10-11} 
$S_{\rm c}$(mJy)$^a$  & $N_{\rm c}$$^b$              & & $S_{\rm c}$(mJy) & $N_{\rm c}$              & 
  & $S_{\rm c}$(mJy)$^c$ & $\Delta N_{\rm c}/\Delta S_{\rm c}$$^d$ & & $S_{\rm c}$(mJy) & 
    $\Delta N_{\rm c}/\Delta S_{\rm c}$ \\
\hline
 400 (0.02) & 3.63 $\times$ 10$^3$ (1.00) & & 400 (0.04) & 7.42 $\times$ 10$^3$ (0.71) & 
  &  &                  & &  &                  \\
 269 (0.02) & 1.09 $\times$ 10$^4$ (0.58) & & 264 (0.04) & 3.22 $\times$ 10$^4$ (0.36) & 
  & 313 (0.02) & 6.51 $\times$ 10$^4$ (0.71) & & 307 (0.04) & 2.26 $\times$ 10$^5$ (0.42) \\
 177 (0.03) & 4.96 $\times$ 10$^4$ (0.28) & & 153 (0.05) & 1.42 $\times$ 10$^5$ (0.22) & 
  & 205 (0.03) & 5.27 $\times$ 10$^5$ (0.32) & & 177 (0.05) & 1.74 $\times$ 10$^6$ (0.26) \\
 106 (0.03) & 1.98 $\times$ 10$^5$ (0.15) & &            &                  & 
  & 122 (0.03) & 3.39 $\times$ 10$^6$ (0.18) & &            &                  \\
  56 (0.03) & 1.43 $\times$ 10$^6$ (0.13) & &            &                  & 
  &  65 (0.03) & 5.31 $\times$ 10$^7$ (0.15) & &            &                  \\
\hline      
 \end{tabular}}
\medskip
$^{-}$ Values in parentheses give errors relative to the 
                       preceding 
                       values; thus, abc $(xyz)$ means $abc \pm abc*xyz$. \\
$^{a}$ $S_{\rm c}$ for cumulative counts is $S_{\rm obs}$ divided 
                       by the flux bias. \\
$^{b}$ $N_{\rm c}$ is the cumulative counts after the correction 
                       applied.  \\
$^{c}$ $S_{\rm c}$ for cumulative counts is $S^{*}_{\rm obs}$ 
                       divided by the flux bias. \\
$^{d}$ $\Delta N_{\rm c}/\Delta S_{\rm c}$ is the differential counts 
                       after the correction has been applied.
\end{table}