\begin{table}%t1
%\centering
\par
\caption{Adopted stellar parameters for the binary system \WRXXIa.\label{table1}}
\begin{tabular}{l r r l}
\hline \hline Variable & WR& OB & Unit \\
\hline Spectral Class. & WN6$^{a}$   & O3 (I)f$^{b}$
&   \\
log ($L/{L}_\odot$) & 5.2$^{c}$   & 6.274$^{d}$
&   \\
$T_{\rm eff}$           & 45~000$^{c}$ & 50680$^{d}$
& K \\ $M_*$           & 12$^{c}$    & 65$^{d}$
& $M_\odot$\\
$\mu$                   & 4$^{c}$ & 1.5$^{c}$
& \\
$v_\infty$              & 2000$^{c}$  &
3150$^{c}$ & km s$^{-1}$\\
$\dot{M}$ expected & $3.0 \times 10^{-5{c}}$
& $1.4 \times 10^{-5{c}}$ & $M_\odot$ yr$^{-1}$ \\
distance $d$            & 3$^{c}$  & 3$^{c}$   & kpc \\
\hline
\noalign{\smallskip}
\multicolumn{4}{l} {$^{a}$ van der Hucht (\cite{vanderHucht01}); $^{b}$ Reig (\cite{Reig99}); $^{c}$ see
text.} \\ \multicolumn{4}{l} {$^{d}$ Vacca et~al. (\cite{Vacca96}).} \\
\end{tabular}
\end{table}