\begin{table}%t6
\caption{\label{xj.15}Stellar populations in each subsample, i.e., results of fitting the combined spectra by using spectra of 15~star clusters as bases.} 
%\centering
\small
\begin{tabular}{c|cccc|ccc}
\hline \hline
Age  & \multicolumn{4}{c|}{Emission-line diagram}  &
\multicolumn{3}{c}{Star-forming in $L_{\rm IR}$ bins}   \\
  & star-forming & composite & LINER & Seyfert 2& ULIG\&LIG & starburst & normal \\
\hline
young & 40.7&28.1& 11.2& 21.0& 43.6& 25.2& 49.8 \\
intermediate &19.2& 35.5& 0.0& 21.7& 16.1& 21.4& 0.0 \\
old&40.1& 36.4& 88.8& 52.4& 32.8& 53.4& 35.0  \\
H~II & 0.0& 0.0& 0.0& 4.8& 7.5& 0.0& 15.2\\
\hline
\end{tabular}
\end{table}