Table 6: Model fittings to the ${\it UBVRI}$ polarization data. The total number of scattering electrons is approximated by $N_{\rm e}\sim W\times 10^{46}.$
Parameter U B V R I
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 $ ($^\circ $) 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
$\theta_{\rm is}$ ($^\circ $) 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


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