\begin{table}%t1
\caption{\label{number}Number of each subsample.}
%\centering
\small
\begin{tabular}{r|rrrr|c}
\hline \hline 
{Method}  & \multicolumn{4}{c|}{Emission-line diagram}  &{Infrared luminosity bin}   \\
 {class} & star-forming & composite & LINER & Seyfert 2 &  \\
\hline
total number   &419   & 326   & 69   & 35   & 849\\
\hline
  ULIG \& LIG  &  100   &   158 &  26 &   15 &  299  \\
 starburst        & 250   &     152 &    32 &    17 & 451  \\
  normal           & 69   &      16 &    11 &     3 & 99  \\
 \hline
\end{tabular}
\end{table}