Table 8: Mean error (uncertainty) of our flux determinations for continuum, H$\alpha $, H$\beta $, H$\gamma $, and HeII 4686emission lines in different years, and in the whole (11 years) observation period. Columns: 2 and 3 - the estimated mean continuum flux error in % and its sigma; 4 and 5 - the estimated mean H$\alpha $ flux error in % and its sigma; 6 and 7 - the estimated mean H$\beta $ flux error in % and its sigma; 8 and 9 - the estimated mean H$\gamma $ flux error in % and its sigma; 10 and 11 - the estimated mean flux error in % and its sigma, Bottom - mean error (uncertainty) in the whole (11 years) observation period.

Year
$\varepsilon_{\rm c}$ $\pm$$\sigma$ $\varepsilon_{\rm H\alpha}$ $\pm$$\sigma$ $\varepsilon_{\rm H\beta}$ $\pm$$\sigma$ $\varepsilon_{\rm H\gamma}$ $\pm$$\sigma$ $\varepsilon_{\rm HeII}$ $\pm$$\sigma$

1996
3.9 2.27 1.9 1.2 3.90 1.56 7.5   10.4 4.20
1997 5.17 2.98 2.19 1.63 1.63 1.81 6.0 1.62 10.22 4.20
1998 2.18 1.37 3.1 2.4 1.90 1.42 5.75 1.62 10.18 4.70
1999 3.24 2.22 1.75 1.28 2.29 1.68 5.65 4.95 6.26 3.00
2000 2.3 3.65 3.62 2.31 2.12 0.82 2.88 2.53 4.65 4.47
2001 3.77 3.16 2.9 1.13 1.63 2.25 4.2 1.7 12.90 4.67
2002 2.05 1.38 2.7 1.66 3.91 2.44 5.37 5.9 5.60 1.56
2003 3.34 2.37 2.8 1.49 2.86 2.44 4.82 2.67 7.62 4.76
2004 2.65 2.26 2.6 0.8 2.25 3.18 3.85 4.45 7.28 4.57
2005 2.37 2.14 2.72 2.63 1.96 2.22 3.3 1.31 7.37 5.86
2006 2.42 1.76 2.12 1.68 1.62 1.34 6.58 1.97 8.62 4.71
mean 2.84 1.23 2.46 0.75 2.37 0.84 4.99 1.46 7.78 2.51
(1996-2006)                    


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