\begin{table}%t3
\caption{\label{castab6}Completeness and signal-to-noise ratio.}
%\centering
\par
\begin{tabular}{lrrrr} 
\hline\hline \noalign{\smallskip}
\multicolumn{5}{c}{9~$\mu$m band} \\ 
\hline
Completeness & 5\% & 50\% & 80\% & 100\% \\
Flux[Jy] & 0.07 & 0.10 & 0.11 & 0.15 \\
$S/N$      & 6.7  & 7.6  & 8.5 & 9.8 \\ 
\hline
\multicolumn{5}{c}{18~$\mu$m band} \\  
Completeness & 5\% & 50\% & 80\% & 100\% \\
Flux[Jy] & 0.10 & 0.16 & 0.21 & 0.28 \\
$S/N$      & 5.0  & 6.5  & 7.6 & 8.7 \\ 
\hline
\end{tabular}
\end{table}