\begin{table}%t3
\caption{\label{err}The estimated mean flux errors of the H$\alpha$~and H$\beta$ lines and
their segments.}
\small%%\centering

\par
\begin{tabular}{lcc}
\hline \hline\noalign{\smallskip}
  Line        &       Region       &    $\sigma \pm e$  \\
       &  [\AA]  & [\%]   \\
\hline
 H$\beta$      &      4909--5353  &  4.3~$\pm$~2.4   \\
 H$\alpha$~     &      6740--7160   &  8.4~$\pm$~6.3   \\\noalign{\smallskip}
%\hline
{\it Line wings and core}                 \\
 H$\beta$-blue wing  &     4977--5097  &   4.2~$\pm$~3.0   \\
 H$\beta$-core       &     5097--5165  &   3.8~$\pm$~2.6   \\
 H$\beta$-red wing   &     5165--5268  &   4.8~$\pm$~3.0   \\
 H$\alpha$-blue wing   &    6720--6882  &   7.2~$\pm$~5.6   \\
 H$\alpha$-core        &    6882--6974  &   10.5~$\pm$~8.2  \\
 H$\alpha$-red wing    &    6974--7136  &   7.9~$\pm$~5.4   \\\noalign{\smallskip}
%\hline
{\it Blue and red part of line}      \\
 H$\beta$-blue part    &   4977--5131  &   4.0~$\pm$~2.9   \\
 H$\beta$-red  part    &   5131--5268  &   4.3~$\pm$~2.8   \\
 H$\alpha$-blue part    &   6720--6928   & 7.8~$\pm$~6.2    \\
 H$\alpha$-red part     &   6928--7136   & 8.8~$\pm$~6.4    \\
\hline
\end{tabular} 
\end{table}