\begin{table}%T4 \par \caption{\label{tab4}The errors in measurements (e$\pm \sigma$) for all line segments (see Table~\ref{tab3}) of H$\alpha$ and H$\beta$ given in percent. For each segment, the mean-year flux is also given in units $10^{-13} \ \rm erg \ cm^{-2} s^{-1} $.} \small%\centering \par \begin{tabular}{ccccccccccccc} \hline\hline Year & \multicolumn{2}{c}{Ha(--5)} & \multicolumn{2}{c}{Ha(+5)} & \multicolumn{2}{c}{Ha(--4)} & \multicolumn{2}{c}{Ha(+4)} & \multicolumn{2}{c}{Ha(--3)} & \multicolumn{2}{c}{Ha(+3)}\\ & Flux & ($e\pm \sigma$) & Flux &($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$) & Flux & ($e\pm \sigma$)\\ \hline 1996 & 6.327 & 9.6$~\pm~$ 9.7 & 7.052 & 13.3$~\pm~$10.5 & 12.456 & 9.9$~\pm~$5.9 & 12.494 & 11.7$~\pm~$7.1 & 22.736 & 9.1$~\pm~$6.8 & 17.722 & 10.9$~\pm~$7.1\\ 1997 & 3.904 & 11.1$~\pm~$ 6.1 & 4.950 & 9.7$~\pm~$ 0.8 & 8.100 & 6.7$~\pm~$8.8 & 10.048 & 9.7$~\pm~$3.8 & 18.741 & 6.7$~\pm~$9.2 & 16.634 & 9.1$~\pm~$5.3\\ 1998 & 2.497 & 11.7$~\pm~$ 4.2 & 4.516 & 7.2$~\pm~$ 6.6 & 6.381 & 5.4$~\pm~$2.4 & 8.904 & 7.4$~\pm~$4.8 & 16.570 & 3.2$~\pm~$2.9 & 16.518 & 4.6$~\pm~$4.7\\ 1999 & 2.030 & 14.3$~\pm~$18.3 & 5.133 & 6.2$~\pm~$ 3.8 & 5.649 & 2.1$~\pm~$3.0 & 8.776 & 3.3$~\pm~$1.1 & 16.851 & 2.2$~\pm~$2.0 & 16.470 & 2.1$~\pm~$1.0\\ 2000 & 1.647 & 5.3$~\pm~$ 4.3 & 3.460 & 4.3$~\pm~$ 3.5 & 3.561 & 4.4$~\pm~$4.4 & 5.570 & 4.2$~\pm~$3.5 & 9.204 & 4.2$~\pm~$3.8 & 7.770 & 3.8$~\pm~$3.6\\ 2001 & 2.251 & 5.5$~\pm~$ 5.3 & 2.906 & 7.3$~\pm~$ 6.2 & 3.671 & 4.7$~\pm~$6.0 & 5.220 & 5.9$~\pm~$6.1 & 7.249 & 7.3$~\pm~$6.0 & 7.760 & 8.1$~\pm~$7.0\\ 2002 & 3.686 & 3.5$~\pm~$ 0.4 & 3.016 & 3.0$~\pm~$ 1.3 & 5.041 & 2.7$~\pm~$2.4 & 6.443 & 4.9$~\pm~$5.3 & 7.792 & 3.6$~\pm~$1.4 & 10.742 & 4.1$~\pm~$5.1\\ 2003 & 3.004 & 5.7$~\pm~$ 5.0 & 4.186 & 2.9$~\pm~$ 1.7 & 4.447 & 4.9$~\pm~$2.4 & 7.560 & 3.4$~\pm~$1.3 & 9.104 & 4.0$~\pm~$2.3 & 14.034 & 2.9$~\pm~$2.1\\ 2004 & 3.261 & 3.2$~\pm~$ 0.8 & 2.722 & 3.3$~\pm~$ 1.8 & 4.340 & 6.1$~\pm~$2.3 & 5.299 & 1.9$~\pm~$1.3 & 6.619 & 5.7$~\pm~$2.4 & 9.922 & 3.9$~\pm~$2.1\\ 2005 & 2.908 & 4.3$~\pm~$ 1.3 & 2.350 & 7.1$~\pm~$ 6.7 & 4.122 & 4.4$~\pm~$3.4 & 4.687 & 5.9$~\pm~$6.2 & 5.756 & 4.5$~\pm~$3.1 & 8.575 & 5.5$~\pm~$4.3\\ 2006 & 2.906 & 1.7$~\pm~$ 0.4 & 1.938 & 1.7$~\pm~$ 1.7 & 3.979 & 3.0$~\pm~$2.7 & 4.115 & 3.0$~\pm~$1.9 & 5.784 & 2.7$~\pm~$2.8 & 10.459 & 1.9$~\pm~$1.3\\ \hline mean && 6.9$~\pm~$4.1 & & 6.0$~\pm~$3.4 & & 4.9$~\pm~$2.2 & &5.6$~\pm~$3.0 & &4.8$~\pm~$2.1 & &5.2$~\pm~$3.0\\ \hline &&&&&&\\ \hline Year & \multicolumn{2}{c}{Hb(--5)} & \multicolumn{2}{c}{Hb(+5)} & \multicolumn{2}{c}{Hb(--4)} & \multicolumn{2}{c}{Hb(+4)} & \multicolumn{2}{c}{Hb(--3)} & \multicolumn{2}{c}{Hb(+3)}\\ & Flux & ($e\pm \sigma$) & Flux &($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$) & Flux & ($e\pm \sigma$)\\ \hline 1996 & 2.511 & 3.2$~\pm~$0.17 & 2.535 & 6.5$~\pm~$ 5.3 & 4.965 & 7.0$~\pm~$ 5 & 4.470 & 7.1$~\pm~$1.5 & 8.003 & 7.6$~\pm~$6.1 & 5.838 & 6.6$~\pm~$2.5\\ 1997 & 1.303 & 17.8$~\pm~$ 2.1 & 1.507 & 11.6$~\pm~$ 2.5 & 3.134 & 4.8$~\pm~$ 5.9 & 3.813 & 4.7$~\pm~$2.0 & 6.391 & 3.5$~\pm~$2.0 & 5.381 & 2.4$~\pm~$0.6\\ 1998 & 0.923 & 13.0$~\pm~$ 9.7 & 1.735 & 5.4$~\pm~$ 2.4 & 2.393 & 4.7$~\pm~$ 3.9 & 3.318 & 4.1$~\pm~$2.5 & 5.268 & 3.0$~\pm~$1.6 & 5.648 & 2.1$~\pm~$1.9\\ 1999 & 1.215 & 19.3$~\pm~$14.0 & 1.594 & 12.1$~\pm~$10.2 & 1.674 & 11.1$~\pm~$10.4 & 2.786 & 6.1$~\pm~$3.2 & 4.403 & 3.1$~\pm~$1.9 & 4.322 & 5.5$~\pm~$3.8\\ 2000 & 0.255 & 6.5$~\pm~$ 7.1 & 0.822 & 14.9$~\pm~$ 5.7 & 0.626 & 7.5$~\pm~$ 3.2 & 1.593 & 3.0$~\pm~$1.3 & 1.654 & 3.2$~\pm~$1.9 & 1.977 & 2.2$~\pm~$1.6\\ 2001 & 0.642 & 10.5$~\pm~$ 8.9 & 1.068 & 15.2$~\pm~$11.7 & 1.064 & 12.8$~\pm~$11.4 & 1.620 & 9.2$~\pm~$9.6 & 1.923 & 3.2$~\pm~$4.2 & 2.210 & 7.8$~\pm~$8.1\\ 2002 & 1.253 & 10.3$~\pm~$ 6.0 & 1.011 & 19.2$~\pm~$10.5 & 1.684 & 8.3$~\pm~$ 6.1 & 2.217 & 7.4$~\pm~$4.8 & 2.165 & 5.7$~\pm~$5.6 & 3.235 & 5.7$~\pm~$5.3\\ 2003 & 1.000 & 9.7$~\pm~$ 6.1 & 1.568 & 7.8$~\pm~$ 2.6 & 1.515 & 4.6$~\pm~$ 2.1 & 2.715 & 5.2$~\pm~$3.4 & 2.627 & 4.1$~\pm~$2.5 & 4.347 & 4.5$~\pm~$3.3\\ 2004 & 1.161 & 9.5$~\pm~$ 6.5 & 1.427 & 12.4$~\pm~$ 7.0 & 1.568 & 8.1$~\pm~$ 6.2 & 1.861 & 5.1$~\pm~$3.7 & 2.062 & 6.7$~\pm~$5.7 & 2.841 & 3.3$~\pm~$1.9\\ 2005 & 1.062 & 3.8$~\pm~$ 3.8 & 0.969 & 10.5$~\pm~$13.0 & 1.458 & 3.5$~\pm~$ 2.3 & 1.535 & 3.4$~\pm~$2.3 & 1.818 & 3.5$~\pm~$3.2 & 2.609 & 8.2$~\pm~$2.8\\ 2006 & 1.012 & 6.6$~\pm~$ 5.5 & 0.886 & 9.2$~\pm~$11.5 & 1.536 & 4.2$~\pm~$ 3.2 & 1.323 & 5.2$~\pm~$4.1 & 2.024 & 3.1$~\pm~$3.1 & 2.841 & 2.6$~\pm~$2.1\\ \hline mean & &10.0$~\pm~$ 5.2& & 11.3$~\pm~$ 4.1& & 7.0$~\pm~$3.0& &5.5$~\pm~$1.8& & 5.2$~\pm~$3.0& & 4.6$~\pm~$2.3\\ \hline &&&&&&\\ \hline Year & \multicolumn{2}{c}{Ha(--2)} & \multicolumn{2}{c}{Ha(+2)} & \multicolumn{2}{c}{Ha(--1)} & \multicolumn{2}{c}{Ha(+1)} & \multicolumn{2}{c}{Ha(0)}\\ & Flux & ($e\pm \sigma$) & Flux &(e$\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$) \\ \hline 1996 & 36.664 & 9.4$~\pm~$6.8 & 29.766 & 11.0$~\pm~$7.0 & 45.469 & 9.1$~\pm~$6.8 & 42.018 & 11.6$~\pm~$7.6 & 48.583 & 11.1$~\pm~$7.6 & & \\ 1997 & 33.714 & 7.0$~\pm~$8.2 & 28.349 & 8.1$~\pm~$7.1 & 43.930 & 6.8$~\pm~$7.1 & 41.554 & 7.9$~\pm~$9.2 & 48.475 & 7.4$~\pm~$8.0 & & \\ 1998 & 27.717 & 3.5$~\pm~$3.2 & 26.397 & 4.6$~\pm~$4.0 & 34.577 & 3.5$~\pm~$3.8 & 36.438 & 6.4$~\pm~$5.5 & 39.903 & 7.3$~\pm~$4.9 & & \\ 1999 & 29.420 & 1.7$~\pm~$2.1 & 27.907 & 1.4$~\pm~$0.8 & 37.880 & 1.5$~\pm~$0.1 & 42.658 & 3.5$~\pm~$2.6 & 48.223 & 2.5$~\pm~$2.2 & & \\ 2000 & 15.153 & 3.9$~\pm~$4.2 & 12.928 & 4.4$~\pm~$3.7 & 19.099 & 4.6$~\pm~$3.9 & 20.783 & 6.6$~\pm~$5.7 & 22.577 & 7.5$~\pm~$6.8 & & \\ 2001 & 11.216 & 8.1$~\pm~$6.3 & 9.774 & 8.0$~\pm~$6.2 & 13.240 & 10.4$~\pm~$8.4 & 11.934 & 10.1$~\pm~$8.4 & 13.292 & 16.2$~\pm~$13.0& & \\ 2002 & 12.285 & 4.1$~\pm~$1.1 & 12.612 & 6.0$~\pm~$2.1 & 18.827 & 4.7$~\pm~$3.8 & 16.231 & 14.9$~\pm~$8.3 & 19.611 & 12.4$~\pm~$4.7 & & \\ 2003 & 16.800 & 2.5$~\pm~$2.2 & 16.071 & 4.6$~\pm~$4.5 & 24.724 & 3.6$~\pm~$2.5 & 21.440 & 13.5$~\pm~$9.0 & 25.761 & 9.8$~\pm~$4.9 & & \\ 2004 & 9.552 & 4.8$~\pm~$1.5 & 12.490 & 9.1$~\pm~$3.2 & 14.567 & 1.4$~\pm~$0.4 & 13.621 & 18.0$~\pm~$4.9 & 14.724 & 9.7$~\pm~$2.5 & & \\ 2005 & 7.416 & 4.3$~\pm~$3.2 & 10.705 & 9.8$~\pm~$5.3 & 9.008 & 8.3$~\pm~$6.2 & 9.852 & 32.0$~\pm~$21.3 & 8.791 & 26.0$~\pm~$25.4& & \\ 2006 & 8.489 & 2.6$~\pm~$2.9 & 13.613 & 2.6$~\pm~$2.0 & 12.402 & 4.2$~\pm~$1.6 & 12.362 & 9.3$~\pm~$4.9 & 12.101 & 12.8$~\pm~$5.6 & & \\ \hline mean& &4.7$~\pm~$2.4 & & 6.3$~\pm~$3.1 & & 5.3$~\pm~$3.0& & 12.2$~\pm~$7.8 & & 11.2$~\pm~$6.1 &&\\ \hline &&&&&\\ \hline Year & \multicolumn{2}{c}{Hb(--2)} & \multicolumn{2}{c}{Hb(+2)} & \multicolumn{2}{c}{Hb(--1)} & \multicolumn{2}{c}{Hb(+1)} & \multicolumn{2}{c}{Ha(0)}\\ & Flux & ($e\pm \sigma$) & Flux &($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$)& Flux & ($e\pm \sigma$) \\ \hline 1996 & 10.383 & 7.0$~\pm~$4.5 & 8.673 & 6.2$~\pm~$1.5 & 11.245 & 6.3$~\pm~$4.5 & 11.531 & 6.7$~\pm~$2.2 & 12.884 & 7.8$~\pm~$3.9 & & \\ 1997 & 9.883& 3.7$~\pm~$2.3 & 8.188 & 3.3$~\pm~$3.1 & 11.509 & 4.1$~\pm~$2.5 & 10.986 & 4.0$~\pm~$3.1 & 13.094 & 4.9$~\pm~$1.1 & & \\ 1998 & 7.688& 2.7$~\pm~$2.5 & 7.905 & 2.1$~\pm~$1.4 & 8.515 & 2.7$~\pm~$2.9 & 9.689 & 1.7$~\pm~$1.4 & 10.530 & 1.8$~\pm~$2.1 & & \\ 1999 & 6.392& 4.1$~\pm~$1.9 & 6.609 & 5.1$~\pm~$2.9 & 6.829 & 6.3$~\pm~$3.9 & 8.664 & 4.8$~\pm~$3.2 & 9.542 & 6.6$~\pm~$6.8 & & \\ 2000 & 2.499& 2.6$~\pm~$2.0 & 2.698 & 1.7$~\pm~$1.0 & 3.105 & 3.9$~\pm~$2.5 & 3.844 & 3.0$~\pm~$1.7 & 4.193 & 5.5$~\pm~$4.6 & & \\ 2001 & 2.613& 4.4$~\pm~$2.5 & 2.716 & 5.6$~\pm~$5.6 & 3.220 & 4.5$~\pm~$4.0 & 3.367 & 2.5$~\pm~$1.3 & 3.772 & 8.0$~\pm~$8.5 & & \\ 2002 & 2.848& 5.0$~\pm~$4.2 & 3.575 & 4.9$~\pm~$3.8 & 4.058 & 5.3$~\pm~$4.2 & 4.222 & 5.3$~\pm~$4.2 & 4.873 & 6.8$~\pm~$4.6 & & \\ 2003 & 4.171& 4.2$~\pm~$2.1 & 4.950 & 3.0$~\pm~$1.5 & 6.619 & 2.9$~\pm~$2.9 & 6.203 & 3.4$~\pm~$3.0 & 7.277 & 4.2$~\pm~$3.2 & & \\ 2004 & 2.280& 5.4$~\pm~$2.5 & 3.476 & 3.3$~\pm~$2.7 & 3.402 & 4.6$~\pm~$4.6 & 3.801 & 3.5$~\pm~$3.1 & 4.153 & 3.9$~\pm~$5.3 & & \\ 2005 & 2.111& 4.0$~\pm~$3.4 & 3.379 & 5.0$~\pm~$2.4 & 2.790 & 4.4$~\pm~$2.5 & 3.395 & 7.7$~\pm~$2.7 & 3.193 & 9.1$~\pm~$4.1 & & \\ 2006 & 2.604& 2.5$~\pm~$2.5 & 3.930 & 1.2$~\pm~$0.9 & 3.007 & 2.0$~\pm~$1.7 & 4.105 & 2.3$~\pm~$1.8 & 3.686 & 3.5$~\pm~$4.0 & & \\ \hline mean & & 4.1$~\pm~$1.3 & & 3.8$~\pm~$1.7 & & 4.3$~\pm~$1.4 & & 4.1$~\pm~$1.9 & & 5.6$~\pm~$2.2 &&\\ \hline \end{tabular} \end{table}