\begin{table}%t2
%\centering
\par
\caption {\label{emission.lines}Emission-line properties of the red-sequence
galaxies for which the  spectra covers both  [OII] and H$\beta$.  The
first two columns indicate whether or not [OII] and H$\beta$ have been
detected (at 2-$\sigma$  level). High and low  [OII]/H$\beta$ stand for
$EW$([OII])$>$18$EW$(H$\beta$)$-$6 and 
${\it EW}{\rm ([OII])}<=18{\it EW}$(H$\beta$)$-$6, respectively.}
\begin{tabular}{lllr}
\hline\hline
[OII]  & H$\beta$ & [OII]/H$\beta$ & Fraction \\
\hline
N      & N        &                &  48.5\% \\
N      & Y        &  uncertain     &  24\% \\
Y      & N        &  high          &   4\% \\
Y      & Y        &  high          &   4\%    \\      
Y      & Y        &  low           &  19.5\%    \\       
\hline
\end{tabular}
\par
\end{table}