\begin{table}%t12
       \caption{\label{tab12}The {\it FWHM} and the ratio $A={{\it HWHM}_{\rm red}/{\it HWHM}_{\rm blue}}$ of the
red/blue, for the averaged and rms profiles of
H$\alpha$ and H$\beta$,  during the three
periods. }
\small%\centering
\par
\begin{tabular}{ccccc}
\hline
\hline
Period &{\it FWHM} (H$\alpha$)& $A_\alpha$ & {\it FWHM} (H$\beta$) &
$A_\beta$\\
\hline
 first & 4780 $\pm$ 350 &0.944 $\pm$ 0.012 & 5980 $\pm$ 550 &0.935 $\pm$ 0.048 \\
second & 4020 $\pm$ 570 &0.872 $\pm$ 0.053 & 5550 $\pm$ 750 &1.086 $\pm$ 0.067 \\
third & 5790 $\pm$ 410 &1.491 $\pm$ 0.075 & 6350 $\pm$ 430 &1.282 $\pm$ 0.112 \\
\noalign{\smallskip}
mean profile & 4650 $\pm$ 420 &1.000 $\pm$ 0.023 & 6110 $\pm$ 440
&1.056 $\pm$ 0.018 \\
\hline 
Period &{\it FWHM} (rms H$\alpha$)& $A_\alpha$ -- rms & {\it FWHM} (rms H$\beta$) &
$A_\beta$ -- rms\\
\hline
 first & 4790 $\pm$ 350 &0.810 $\pm$ 0.046 & 5430 $\pm$ 530 &0.596 $\pm$ 0.017 \\
second & 3100 $\pm$ 480 &1.061 $\pm$ 0.026 & 3700 $\pm$ 550 &0.811 $\pm$ 0.068 \\
third & 3150 $\pm$ 350 &0.816 $\pm$ 0.038 & 3760 $\pm$ 1100 &1.168 $\pm$ 0.210
\\
\noalign{\smallskip}
mean rms & 4420 $\pm$ 320 &0.830 $\pm$ 0.011 & 5490 $\pm$ 420 &0.775 $\pm$ 0.023
\\
\hline
\end{tabular} 
\end{table}