\begin{table}%t1
%\centering
\par
\caption{System parameters for Sk~160/SMC~X-1. The two values for 
$K_{\rm o}$ are those resulting from fitting the He~I absorption line RV 
curve without and with heating corrections respectively. The four 
columns for the various inferred parameters are the limiting values assuming
$\beta = 1$ and $i = 90^{\circ}$ for each of these two values of 
$K_{\rm o}$ as discussed in the text.}
\label{tab1}
\begin{tabular}{lllll} \hline\hline
Parameter & \multicolumn{2}{c}{Fit to raw RV curve} & \multicolumn{2}{c}{Fit to corrected RV curve}    \\ \hline
$\gamma$/km~s$^{-1}$          & \multicolumn{2}{c}{$174.1 \pm 1.5$} & \multicolumn{2}{c}{$173.8 \pm 1.5$}    \\
$K_{\rm o}$/km s$^{-1}$       & \multicolumn{2}{c}{ $18.0 \pm 1.8$} & \multicolumn{2}{c}{ $21.8 \pm 1.8$}    \\
$q$                             & \multicolumn{2}{c}{$0.060 \pm 0.006$} & \multicolumn{2}{c}{$0.073 \pm 0.006$}\\
                                & Roche lobe-filling & edge-on          & Roche lobe-filling & edge-on \\
                                &(upper mass limits)&(lower mass limits)&(upper mass limits)&(lower mass limits) \\
$\beta$                         & $1.00$          & $0.77 \pm 0.02$     & $1.00$          & $0.79 \pm 0.02$      \\
$i$/deg                       & $64.0 \pm 1.3$  & $90.0$              & $65.3 \pm 1.3$  & $90.0$               \\
$M_{\rm x}$/$M_{\odot}$       & $1.01 \pm 0.10$ & $0.73 \pm 0.08$     & $1.21 \pm 0.10$ & $0.91 \pm 0.08$      \\
$M_{\rm o}$/$M_{\odot}$       & $16.8 \pm 0.5$  & $12.1 \pm 0.2$      & $16.6 \pm 0.4$  & $12.5 \pm 0.1$       \\
$a$/$R_{\odot}$               & $27.4 \pm 0.3$  & $24.6 \pm 0.2$      & $27.3 \pm 0.3$  & $24.7 \pm 0.1$       \\
$R_{\rm L}$ /$R_{\odot}$      & $16.7 \pm 0.3$  & $14.9 \pm 0.1$      & $16.3 \pm 0.2$  & $14.8 \pm 0.1$       \\
$R_{\rm o}$/$R_{\odot}$       & $16.7 \pm 0.3$  & $11.5 \pm 0.3$      & $16.3 \pm 0.2$  & $11.7 \pm 0.3$       \\ \hline
\end{tabular}
\end{table}