\begin{table}%t3
\caption{\label{tab3}Parameters used for surface model A,B,C in fitting the observations
of Fig.~\ref{fig4}.}
 \small%\centering
\par
\begin{tabular}{cccc} 
\hline
\hline
Model & $\epsilon$ & {\it k}$_{\lambda}$ & tan$\Delta$ \\
\hline \noalign{\smallskip}
 A  & 1.0     & 20  & $8\times10^{-3}$ \\
 B  & 1.5$-$2.0 & 20  & 5.5$-$6.$5\times10^{-3}$ \\
 C  & 1.5     & 10$-$15 & 9$-$1$3\times 10^{-3}$ \\
\hline 
\end{tabular} 
\end{table}