\begin{table}%t2
\caption{\label{tab:results}Summary of orbital and physical parameters of \object{W13}\tablefootmark{a}.}
%\centering
\par
\begin{tabular}{lll}
\hline \hline \noalign{\smallskip}
Parameter & Value\\
\hline
$T_0$ (MJD)\tablefootmark{a}                      & 54~643.080\\
$P$ (days)                            & $9.2709\pm0.0015$\\
$q=m_{{\rm abs}}/m_{{\rm em}}$      & $1.53\pm0.10$\\
$a$ ($R_\odot$)                       & $72\pm$3\\
$e$                                   & 0 (fixed)\\
$i$                                   & 62$^{+3}_{-4}$$^{\circ}$\\[2pt]
\hline
                                      & Emission      & Absorption\\ 
Filling factor                        & $0.93\pm0.05$ & $0.74\pm0.1$\\
$T_{{\rm eff}}$ (K)                  & 25~000 (fixed) & $25~000 \pm 2000$\\
$R$ ($R_\odot$)                       & 22 $\pm$ 2      & 21 $\pm$ 2\\
$\gamma$ (km~s$^{-1}$)                 & $-48.2\pm3.1$ & $-65.9\pm2.4$\\
$K$ (km~s$^{-1}$)                      & $210.2\pm8.7$ & $137.3\pm6.7$\\
$M$sin$^3i$ ($M_\odot$)               & $15.9\pm1.9$  & $24.4\pm3.0$\\ 
$M (i=65^\circ)$ ($M_\odot$)          & $21.4\pm2.6$  & $32.8\pm4.0$\\
$M (i=62^{+3\circ}_{-4})$ ($M_\odot$) & $\rm 23.2^{+3.3}_{-3.0}$ & $\rm 35.4^{+5.0}_{-4.6}$\\[2pt]
\hline
\end{tabular}
\tablefoot {\tablefoottext{a}{Note that $T_0$ corresponds to the eclipse of the B0.5Ia$^+$ emission-line star.}}
\end{table}