\begin{table}%t3
\par
%\centering
\caption{The excess variances of the 300 s binned light curves.\label{tab3}}
\begin{tabular}{c|cccc}
\hline\hline
Obs. period & \multicolumn{4}{c}{$\sigma^2_{\rm rms}$} \\
            & \multicolumn{4}{c}{($\times 10^{-3}$)}  \\
            & [0.2--0.8] keV & [0.8--2.4] keV & [2.4--10] keV & [0.2--10] keV \\
\hline
4--11(1) & $0.33\pm0.15$ & $0.39\pm0.30$ & $2.53\pm2.00$ & $0.35\pm0.15$ \\
4--11(2) & $0.76\pm 0.19$ & $1.23\pm0.40$ & $3.59\pm1.91$ & $0.78\pm0.17$ \\
14--11    & $21.14\pm 2.24$ & $40.96\pm4.33$ & $86.95\pm 10.04$ & $32.76\pm3.46$ \\
1--12 & $0.77\pm0.08$ & $1.73\pm0.16$ & $4.02\pm0.43$ & $1.07\pm0.10$ \\
\hline
\end{tabular}
\end{table}