\begin{table}%T2
%%\centering
\par
\caption{(b). Linear polarization of MS~Ser in 2001.}\label{tab2b}
\begin{tabular}{cccccccccccc}
\hline\hline%\noalign{\smallskip}
band & $<P_x>$ &$\sigma$ & $\chi^2/(N-1)$ &$F_{\rm var}$&$<P_y>$&$\sigma$&$\chi^2/(N-1)$&$F_{\rm var}$ &$<P>$&$\sigma$&$P_{\rm s}$  \\
%\noalign{\smallskip}
\hline%\noalign{\smallskip}
 $U$ & 0.016 & 0.256 & 5.62 &$>$99& 0.279 & 0.203 & 7.40 &$>$99& 0.208 & 0.092 & $0.234 \pm 0.026$ \\
 $B$ &$-$0.063 & 0.129 & 5.02 &$>$99& 0.126 & 0.080 & 3.27 &  99 & 0.141 & 0.080 & $0.151 \pm 0.024$ \\
 $V$ &$-$0.029 & 0.069 & 5.38 &$>$99& 0.007 & 0.057 & 3.24 &  99 & 0.091 & 0.039 & $0.109 \pm 0.009$ \\
 $R$ & 0.013 & 0.022 & 1.23 &  59 &$-0.017$ & 0.025 & 1.06 &  49 & 0.047 & 0.028 & $0.067 \pm 0.008$ \\
 $I$ & 0.004 & 0.024 & 1.30 &  62 & 0.008 & 0.032 & 1.62 &  76 & 0.035 & 0.015 & $0.039 \pm 0.006$ \\
%\noalign{\smallskip}
\hline
\end{tabular}
\end{table}