\begin{table}%t6
\caption{Overdensities of the three samples.\label{overdens}} 
%\centerline
{\begin{tabular}{l c c c c c c} \hline \hline
$R_{1138}$ &
\multicolumn{2}{r}{$<$40\arcsec} & 
\multicolumn{2}{r}{$<$60\arcsec} & 
\multicolumn{2}{r}{20\arcsec--60\arcsec} \\
\multicolumn{1}{c}{(1)} & (2) & (3) & (2) & (3) & (2) & (3) \\ \hline
%EROs & 5.3 & 2.9 & 3.5 & 3.2 & 3.3 & 3.3 \\
EROs & 4.7 & 2.5 & 3.2 & 2.9 & 3.3 & 3.3 \\ %nohalo
%\ha\ & 5.5 & 2.9 & 2.9 & 2.8 & 2.8 & 3.0 \\
\ha\ & 4.8 & 2.6 & 2.6 & 2.5 & 2.8 & 3.0 \\ %nohalo
%\lya & 6.1 & 2.4 & 4.4 & 2.6 & 2.7 & 1.6 \\
\lya & 2.6 & 1.0 & 3.1 & 1.5 & 3.1 & 1.7 \\ 
\hline 
\end{tabular}}
\smallskip
\noindent Notes: (1) Sample, either EROs, candidate
\lya\ or \ha\ emitters; (2) density in terms of background density; (3)
significance ($\sigma$) of (2).
%%\end{center}
\par
\end{table}