Table 13: Time lags and CCF coefficients for the whole monitoring period, for the three periods based on the profile shapes, and for the division based on the three values of the continuum intensity.
Period H$\alpha $ CCF H$\alpha $-cent H$\beta $ CCF H$\beta $-cent

1996-2006
$\rm 5.70^{+27.05}_{-5.70}$ $\rm0.87^{+0.02}_{-0.02}$ 80.36 $\pm$ 12.93 $\rm 5.09^{+27.89}_{-5.09}$ $\rm0.93^{+0.01}_{-0.01}$ 69.79 $\pm$ 11.91

First
$\rm0.68^{+3.30}_{-0.68}$ $\rm0.67^{+0.09}_{-0.10}$ 0.62 $\pm$ 1.11 $\rm 1.11^{+4.90}_{-1.11}$ $\rm0.82^{+0.04}_{-0.05}$ 11.61 $\pm$ 2.87
Second $\rm 21.86^{+9.03}_{-10.53}$ $\rm0.78^{+0.11}_{-0.14}$ 66.07 $\pm$ 9.95 $\rm 11.15^{+5.00}_{-4.17}$ $\rm0.88^{+0.06}_{-0.07}$ 8.15 $\pm$ 2.38
Third $\rm0.81^{+1.55}_{-0.81}$ $\rm0.94^{+0.02}_{-0.02}$ 3.18 $\pm$ 1.76 $\rm0.81^{+2.19}_{-0.81}$ $\rm0.86^{+0.03}_{-0.04}$ 16.17 $\pm$ 3.14

Continuum
H$\alpha $ CCF H$\alpha $-cent H$\beta $ CCF H$\beta $-cent

$F_{\rm con}^1$
$\rm0.27^{+0.73}_{-0.27}$ $\rm0.51^{+0.22}_{-0.27}$ - $\rm 25.15^{+13.77}_{-20.16}$ $\rm0.50^{+0.23}_{-0.28}$ -
$F_{\rm con}^2$ $\rm 19.36^{+10.42}_{-5.44}$ $\rm0.66^{+0.14}_{-0.17}$ 0.56 $\pm$ 6.245 $\rm0.62^{+3.49}_{-0.62}$ $\rm0.70^{+0.07}_{-0.08}$ 2.71 $\pm$ 5.22
$F_{\rm con}^3$ $\rm 1.19^{+6.01}_{-1.19}$ $\rm0.67^{+0.07}_{-0.08}$ 13.65 $\pm$ 4.47 $\rm0.70^{+2.94}_{-0.70}$ $\rm0.82^{+0.04}_{-0.04}$ 12.28 $\pm$ 5.26


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