\begin{table}%t1
\caption{Fit results of our NPOI data to models of a~uniform disc (UD)
and a~fully darkened (FDD) disc. The formal errors of the diameter values
are $\sim$$0.01$~mas, additional calibration uncertainties are
$\sim$$0.06$~mas, total errors thus $\sim$$0.06$~mas.}
\label{tab:alphas}
%\centering
\small
\begin{tabular}{lrrr}
\hline\hline
 %& & & \\[-8pt]
Model & Diameter & Parameter $\alpha$ & $\chi^2_\nu$ \\\hline
UD             & $\Theta_{\rm UD}=5.64$~mas  & $\alpha=0$ & 11.0\\
FDD            & $\Theta_{\rm FDD}=6.59$~mas & $\alpha=1$ & 5.6 \\\hline
\end{tabular}
\end{table}