\begin{table}%t2
\caption{\label{models}Best fit model parameters for Polaris and its
      CSE. $\theta_\star$ is the stellar angular diameter (mas),
      $\alpha$ the CLD~coefficient, $\theta_{\rm s}$ the shell angular
      diameter (mas), $w$ the shell width (mas) and $F_{\rm s}/F_\star$ the
      relative brightness (Fig.~\ref{model_ring}). Last column
      tabulates the reduced $\chi^2$. Only parameters with error bars
      (lower scripts) have been fitted. The first line is the
      hydrostatic model; the second line is the adjusted CLD; the
      model of the last line includes a shell.}
    \small%\centering
\par
      \begin{tabular}{lllllc}
	\hline \hline 
	\noalign{\smallskip}
	$\theta_\star$ &$\alpha$& $\theta_{\rm s}$ & $w$ &
	$F_{\rm s}/F_\star$ & $\chi^2$\\ 
	\hline 
	$3.152_{\pm 0.003}$ & 0.16 & -- & -- & -- & 4.5\\ 
	$3.189_{\pm 0.005}$ & $0.26_{\pm 0.01}$ & --  & -- & -- & 2.5\\ 
	$3.123_{\pm 0.008}$ & $0.16$ & $7.5_{\pm 0.2}$ & 0.5 &
	$1.5_{\pm 0.4}\%$ & 1.4 \\ 
	\hline
      \end{tabular}
   \end{table}