\begin{table}%t2
\caption{The parameters of the orbital modulation of the emission lines radial velocities.}
\label{velocity}
%\begin{center}
\par
\begin{tabular}{l l l r }
\hline \hline\\[-3mm]
Lines &  $\gamma$ ( \kms )  & $K$ ( \kms ) &  Phase (*)  \\
\hline
\Hg    & --24.5 (5.2)    & 47.1 (6.9)    & --0.07 (0.07)   \\
\HeII  & --60.1 (8.7)    & 71.3 (11.7)  &  +0.08 (0.09)  \\
\Hb    & --30.6 (4.5)    & 53.9 (6.1)    & --0.07 (0.06)   \\
\Ha    & --31.6 (3.0)    & 60.0.(4.0)    &   0.0   (fixed)   \\           
\hline
\end{tabular}
%\end{center}
\par
* Phase of the blue-to-red zero crossing. \\
1-$\sigma$ error bars into parentheses.\\
\end{table}