\begin{table}%T2
%%\centering
\par
\caption{(a). Linear polarization of MS~Ser in 2000.}
\label{tab2}
\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}
 $U$ & 0.033 & 0.265 & 5.80 &$>$99& 0.192 & 0.225 & 1.94 &  88 & 0.339 & 0.177 & $0.380 \pm 0.062$ \\
 $B$ & 0.024 & 0.030 & 0.41 &   8 & 0.045 & 0.089 & 4.10 &$>$99& 0.070 & 0.078 & $0.128 \pm 0.054$ \\
 $V$ & 0.041 & 0.054 & 1.43 &  72 & 0.056 & 0.058 & 2.10 &  92 & 0.090 & 0.048 & $0.090 \pm 0.016$ \\
 $R$ &$-$0.007 & 0.032 & 1.90 &  87 & 0.013 & 0.029 & 1.90 &  87 & 0.041 & 0.015 & $0.048 \pm 0.005$ \\
 $I$ & 0.017 & 0.030 & 1.81 &  84 & 0.020 & 0.042 & 1.84 &  86 & 0.050 & 0.023 & $0.060 \pm 0.005$ \\
%\noalign{\smallskip}
\hline
\end{tabular}
\end{table}