\begin{table}%t2
      \caption{Radial velocity of the ripples numbered on the H$\alpha$ and
                 OI~8447~\AA\ emission line profiles of Fig.~\ref{fig2}.}
      \label{tab2}
     %\centering
\small
     \begin{tabular}{lccccc}
\hline \hline
\noalign{\smallskip}
 & \multicolumn{5}{c}{Component velocity (km~s$^{-1}$)} \\
   \cline{2-6}
 & {\it 1} & {\it 2}& {\it 3}& {\it 4} & {\it 5} \\
 H$\alpha$ & --970  & --595 & --260 & +180 & +705 \\
 OI 8446~{\AA} & --990 & --655 & --250 & +200 & +695 \\
      \hline
      \end{tabular}
  \end{table}