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Table 4:

The errors in measurements (e $\pm \sigma $) for all line segments (see Table 3) of H$\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} $.
Year Ha(-5) Ha(+5) Ha(-4) Ha(+4) Ha(-3) Ha(+3)
  Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$)
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~$1.3
mean   6.9$~\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
Year Hb(-5) Hb(+5) Hb(-4) Hb(+4) Hb(-3) Hb(+3)
  Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$)
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~$2.1
mean   10.0$~\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
Year Ha(-2) Ha(+2) Ha(-1) Ha(+1) Ha(0)    
  Flux ( $e\pm \sigma$) Flux (e $\pm \sigma $) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$)    
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~$5.6    
mean   4.7$~\pm~$2.4   6.3$~\pm~$3.1   5.3$~\pm~$3.0   12.2$~\pm~$7.8   11.2$~\pm~$6.1    
Year Hb(-2) Hb(+2) Hb(-1) Hb(+1) Ha(0)    
  Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$) Flux ( $e\pm \sigma$)    
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~$4.0    
mean   4.1$~\pm~$1.3   3.8$~\pm~$1.7   4.3$~\pm~$1.4   4.1$~\pm~$1.9   5.6$~\pm~$2.2    


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