\begin{table}%T7
\par
%\centering
\par
\caption{Parameters of the binary orbit for the SB2 star HD~221866.
The final rms of the residuals is 2.28~\kms.
}
\label{table6}
$$
\begin{tabular}{rcl}
\hline\hline
$P$            & = & $135.19 \pm 0.52$~d    \\
$T_0$          & = & $2~450~412.41 \pm 0.29$~d  \\
$e$            & = & $0.683 \pm 0.013$           \\
$\gamma$       & = & $-13.7 \pm 0.3$~\kms \\
$K_1$          & = & $38.1 \pm 1.0$~\kms \\
$\omega_1$     & = & $206.1 \pm 2.3^{\circ}$     \\
$K_2$          & = & $43.1 \pm 1.1$~\kms \\
$\omega_2$     & = & $26.1 \pm 2.3^{\circ}$     \\
$a_1 \sin i$   & = & $(51.78 \pm 2.45)\times10^6$~km   \\
$M_1.\sin^3 i$ & = & $1.556 \pm 0.090$~$M_{\sun}$ \\
$a_2 \sin i$   & = & $(58.52 \pm 2.70)\times10^6$~km   \\
$M_2.\sin^3 i$ & = & $1.376 \pm 0.080$~$M_{\sun}$ \\
\hline
\end{tabular}$$
\end{table}