\begin{table}%t2
%\centering
\par
\caption{Times of extrema in the light curve of QW Ser in February 2003.\label{tab2}}
\begin{tabular}{|l|c|r|l|c|r|}
\hline
\hline
\multicolumn{3}{|c||}{\bf Maxima} & \multicolumn{3}{|c|}{\bf Minima} \\
\hline
$E$ & HJD & O--C & $E$ & HJD & O--C\\
\hline
0 & 694.617 & 0.021 & 0 & 694.580 & $-0.037$ \\
12 & 695.536 & 0.003 & 1 & 694.661 & 0.011 \\
13 & 695.612 & $-0.019$ & 12 & 695.513 & 0.039 \\
14 & 695.685 & $-0.062$ & 13 & 695.593 & 0.074 \\
26 & 696.610 & $-0.008$ & 14 & 695.663 & $-0.020$ \\
39 & 697.613 & 0.062 & 26 & 696.589 & $-0.034$ \\
   &          &          & 27 & 696665 & $-0.051$ \\
   &          &          & 39 & 697.598 & $0.019$ \\
   &          &          & 40 & 697.671 & $-0.030$ \\
\hline
\end{tabular}
\end{table}