\begin{table}%T5
\par
%\centering
\par
\caption{Parameters of the binary orbit for the star HD~80731.
The final rms of the residuals is 2.61~\kms.
Note that we have only used here the velocities computed from a Gaussian fit.}
\label{table4}
$$
\begin{tabular}{rcl}
\hline\hline
$P$          & = & $13.572 \pm 0.011$~d    \\
$T_0$        & = & $2~452~283.30 \pm 1.43$~d  \\
$e$          & = & $0.133 \pm 0.047$           \\
$\gamma$     & = & $-7.3 \pm 1.1$~\kms \\
$K$          & = & $23.2 \pm 1.2$~\kms \\
$\omega$     & = & $2. \pm 35.^{\circ}$     \\
$a \sin i$   & = & $(4.30 \pm 0.25)\times10^6$~km   \\
$M.\sin^3 i$ & = & $0.017 \pm 0.003$~$M_{\sun}$ \\
\hline
\end{tabular}$$
\end{table}