\begin{table}%t1
\caption{Mean properties of the three galaxy SED class samples. 
\label{class3} }
%\centering
\par
\begin{tabular}{lrrr}
\hline  \hline  
property	&  Dust-free old	& Dusty red-seq		& Blue cloud  \\ 
  \hline  
$N_{\rm galaxy}$		&  294	&  168	&  333  \\
$N_{\rm field~~ contamination}$	&   6	&   7	&   49  \\  
$N_{\rm spectra}$		&  144	&   69	&   36  \\ 
  \hline  
$z_{\rm spec}$		&0.1646	&0.1646	&0.1658 \\  
$\sigma_{cz}/(1+z)$/(km~s$^{-1}$)	& 939	& 1181	& 926 \\   
$z_{\rm spec, N}$		&0.1625	&0.1615	& N/A \\  
$z_{\rm spec, S}$		&0.1679	&0.1686	& N/A \\   
$\sigma_{cz,\rm N}/(1+z)$/(km~s$^{-1}$)	& 589	& 597	& N/A  \\  
$\sigma_{cz,\rm S}/(1+z)$/(km~s$^{-1}$)	& 522	& 546	& N/A  \\  
$\log (\Sigma_{10} ({\rm Mpc}/h)^2)$	& 2.188 & 1.991	& 1.999 \\    
$EW_{\rm e}$ (O{\sc ii})/\AA	& 	N/A	& $4.2\pm 0.4$	& $17.5\pm 1.5$ \\
$EW_{\rm a}$ (H$\delta$)/\AA	& $2.3\pm 0.5$	& $2.6\pm 0.5$	& $ 4.5\pm 1.0$ \\
 \hline  
age/Gyr			&  6.2	&  3.5	&  1.2  \\    
$E_{B-V}$		& 0.044	& 0.212	& 0.193 \\   
$(U-V)_{\rm rest}$	& 1.372	& 1.293	& 0.670 \\  
$M_{V,\rm rest}$	&$-19.31$	&$-19.18$	&$-18.47$ \\
  \hline  
$B-R	$	& 1.918	& 1.847	& 1.303 \\
$V-I	$	& 1.701	& 1.780	& 1.290 \\
$R-I	$	& 0.870	& 0.920	& 0.680 \\
$U-420$		& 0.033	&$-0.079$	&$-0.377$ \\
$420{-}464$	& 0.537	& 0.602	& 0.560 \\
$464{-}518$	& 0.954	& 0.827	& 0.490 \\
$604{-}646$	& 0.356	& 0.339	& 0.238 \\
$753{-}815$	& 0.261	& 0.274	& 0.224 \\
 \hline
\end{tabular}
\end{table}