\begin{table}%t1
\caption{\label{tab1}Sample completeness.} 
%\centering
\par
\begin{tabular}{lllll}
\hline\hline
  & \multicolumn{2}{c}{Type $<$ Sa} & \multicolumn{2}{c}{Type $\geq$ Sa}\\ 
  & All & \HI~& All & \HI~\\   
\hline
 Coma members    & 391 & 58 & 263 & 249 \\   
HL         & 24  & 10  & 52 &  46 \\
Background & 131 & 5  & 118 &  55 \\    
Foreground & 46  & 16 & 102 & 92 \\   
All        & 592 & 89 & 535 & 442 \\   
 \hline
\end{tabular}
\end{table}