\begin{table}%t4
%\centering
\par
\caption{Model fittings to the ${\it UBVRI}$ polarization data. The
total number of scattering electrons is approximated by $N_{\rm e}\sim
W\times 10^{46}.$ \label{tab4}}
\begin{tabular}{lccccc}
\hline \hline
Parameter & $U$ & $B$ & $V$ & $R$ & $I$  \\
\hline
%   & & & & &\\
%   Shell   & 134 $\pm$ 7   & 78 $\pm$ 37 & 35 $\pm$ 47 & 78 $\pm$ 37 & 35 $\pm$ 47 \\
%   Disk    & \ \ \ 1 $\pm$ 9 & 19 $\pm$ 13 & 17 $\pm$ 13 & 19 $\pm$ 13 & 17 $\pm$ 13  \\
%   Stream  & 14.0 $\pm$ 0.9  & 11.3 $\pm$ 6.0  & {-12.3 $\pm$ 6.0   } & 11.3 $\pm$ 6.0  & {-12.3 $\pm$ 6.0   } \\
   $W$(1981-84)    & 8.3 $\pm$ 0.8  & 7.8 $\pm$ 0.8 & 5.7 $\pm$ 1.2 & 5.9 $\pm$ 1.3 & 3.0 $\pm$ 1.8\\
   $W$(2000) & 2.8 $\pm$ 1.9 & 2.5 $\pm$ 1.9 & 3.3 $\pm$ 1.8 & 1.9 $\pm$ 1.8 & 1.4 $\pm$ 3.0\\
   $\Omega$ (\deg) & 78.8 $\pm$ 1.9 & 85.2 $\pm$ 2.1 & 81.6 $\pm$ 2.6 & 74.3 $\pm$ 2.6 & 77.6 $\pm$ 2.8\\
   $q_{\rm is}$(\%) & 0.19 $\pm$ 0.02 & 0.28 $\pm$ 0.01 & 0.27 $\pm$ 0.01 & 0.25 $\pm$ 0.01 & 0.23 $\pm$ 0.01\\
   $u_{\rm is}$(\%) & 0.45 $\pm$ 0.02 & 0.47 $\pm$ 0.01 & 0.49 $\pm$ 0.01 & 0.44 $\pm$ 0.01 & 0.39 $\pm$ 0.01\\
   $p_{\rm is}$(\%) & 0.49 $\pm$ 0.02 & 0.56 $\pm$ 0.01 & 0.56 $\pm$ 0.01 & 0.50 $\pm$ 0.01 & 0.45 $\pm$ 0.01\\
   $\theta_{\rm is}$ (\deg) & 33.6 $\pm$ 1.4 & 29.7 $\pm$ 0.7 & 30.4 $\pm$ 0.6 & 30.4 $\pm$ 0.8 & 29.5 $\pm$ 0.7\\
%   & & & & &\\
%    $\lambda_{spot}$ (\deg) & -160 & -120 & -150 \\
%   $\phi_{spot}$ (\deg) &   { +65}&   { +55}&   { +55}\\
\hline
\end{tabular}
\end{table}