\begin{table}%t3
\par
\caption{\label{tab:model}Model parameters for \object{W243}.}
\small%\centerline
 {
\begin{tabular}{ll}
\hline\hline \noalign{\smallskip}
Parameter        & Value$^{a}$ \\
\hline 
&\\[-8pt]
$L_{*}$          & $7.3\times10^{5}~(d/4.5~{\rm kpc})^{2}~L_{\odot}$  \\  
$R_{*}$          & $376.9~(d/4.5~{\rm kpc})~R_{\odot}$ \\
$R_{2/3}$        & $450.0~(d/4.5~{\rm kpc})~R_{\odot}$ \\
$T_{{\rm eff}}$ & $\sim$8500~K$^{b}$\\
$\dot{M}$        & $6.1$~$\times$ $10^{-7}~(d/4.5~{\rm kpc})^{1.5}~M_{\odot}$~yr$^{-1}$ \\
$V_{\infty}$     & 165~km~s$^{-1}$\\
$v~ \sin i$  & 10~km~s$^{-1}$\\
log~$g$          & $\sim$0.65$^{c}$ \\
H/He             & 5\\
N/N$_{\odot}$    & 12.1\\
O/O$_{\odot}$    & 0.11\\
Ca/Ca$_{\odot}$  & 2.49\\
Mg/Mg$_{\odot}$  & 1.34\\
Si/Si$_{\odot}$  & 1.51\\
Fe/Fe$_{\odot}$  & 1.22\\
\hline 
\end{tabular}}
\medskip
$^{a}$ Values for $V_{\infty}$, $v~{\rm sin}i$ and H/He are assumed, all others are derived. Values are for a distance of 4.5~kpc \citep{cncg05,crowther06}, with scaling listed where appropriate.\\
$^{b}$~Limits are 8300~$\le$ $T_{{\rm eff}}$~$\le$ 9300~K, favouring a value at the lower end of this range.\\ 
$^{c}$ Best fit to the higher Paschen-series absorption lines.
\end{table}