\begin{table}%t2
%\centering
\par
\caption{\label{elem13}Several sets of orbital elements.}
\par
\begin{tabular}{llllccc}
\hline\hline\noalign{\smallskip}
Solution:             & 1                & 2             & 3         \\
orbital                & Old \& new       & \ha emis.     & \ha emis. \\
element                & \ha abs.         & wings         & wings      \\
\hline\noalign{\smallskip}
$P$ (d)                & 218.023\p0.023   &218.099\p0.050 & 218.053\p0.053\\
$T_{\rm periastr.}$ (d)& 40040.4\p1.6     &52039.34\p0.69 & 52039.73\p0.73\\
$T_{\rm super.c.}$ (d) & 40032.3          &52035.50       & 52034.79      \\
$T_{\rm min.~RV}$ (d) & 40044.5          &52040.64       & 52041.11      \\
$e$                    & 0.596\p0.035     &0.774\p0.028   & 0.745\p0.026  \\
$\omega (^\circ)$      & 147.7\p4.5       &154.2\p4.0     & 157.3\p3.5    \\
$K_1$ (\ks)            & 5.41\p0.35       &6.30\p0.63     & 6.39\p0.46    \\
$\gamma$ (\ks)         & --0.15\p0.1       &0.35\p0.15     & --            \\
rms (\ks)              &  3.21            &1.93           & 1.58         \\
\hline\noalign{\smallskip}
\end{tabular}
\tablefoot{Solution~1... Katahira, Rivinius and this paper, prewhitened with HEC13; Solution~2... New emission-line RVs prewhitened with HEC13; Solution~3... New emission-line RVs with allowance for locally derived $\gamma$~velocities.} 
\vspace*{2.5mm}
\end{table}