\begin{table}%t3
%\centering
\par
\caption{The different categories of \Ha profiles versus the types
  of \OI profiles. The entries of the table are the number of
  stars belonging to the corresponding category. U: undetected
  feature, E: pure-emission profile, A: 6300~\A region rich in
  photospheric absorption lines, S: single-peaked profile, D: double-peaked
  profile, P: \hbox{P Cyg}-like profile, inv. P: inversed \hbox{P
  Cyg}-like profile. 
\label{halphavsoi}}
\begin{tabular}{lcccc}
\hline\hline
 \multicolumn{1}{r}{\OI} &
 \multicolumn{1}{c}{U} &
 \multicolumn{1}{c}{E} &
 \multicolumn{1}{c}{A} &
 \multicolumn{1}{c}{Tot.} \\
 \multicolumn{1}{l}{\Ha~~~~~~~~~} &
 \multicolumn{3}{c}{} & 
 \multicolumn{1}{c}{}\\
 \hline
U       & 0 & 1 & 0 & 1  \\
S       & 0 & 5 & 5 & 10 \\
D       & 6 & 15& 4 & 25 \\
P       & 4 & 7 & 1 & 12 \\
Inv. P  & 0 & 1 & 0 & 1  \\
 \hline
Tot.    &10 & 29& 10& 49 \\
\hline
\end{tabular}
\end{table}