\begin{table}%t4
\caption{Angular diameter determinations with plane-parallel and spherical
  {\sc marcs} models. Only a very small improvement on the chi-square value can
  be achieved by increasing the extension of the atmosphere of the model (SPH model
  with $\log{g}=1.0$), and such a low surface gravity cannot be reconciled
  with the spectral features. 
}
\label{table:diameters}
%\vspace{1ex}
%\begin{center}
\par
\begin{tabular}{lccc}
\hline
\hline
Model                           & PP, 4250~K      & SPH, 4250~K       & SPH, 4250~K       \\
                                & $\log g=1.5$   & $\log g=1.0$     & $\log g=1.5$     \\
\hline
$\phi$ (mas)                    & $21.32\pm0.19$ & $22.37 \pm 0.19$ & $21.84 \pm 0.21$ \\
$\phi_{\tau_{\rm Ross}=1}$   & NA             & $21.16 \pm 0.18$ & $21.19 \pm 0.20$ \\
$d$ (Eq.~(\ref{eq:def_ext})$^*$) & 0.030          & 0.057            & 0.030            \\
$\chi^{2}_{{\rm r}}$         & 5.63           & 5.38             & 5.51             \\
\par
\hline\\[-2mm]
\multicolumn{4}{l}{$^*$ Out to $\tau_{\rm Ross} = 10^{-7}$.} 
\end{tabular}
%\end{center}
\par
\end{table}