**Table 1:** The parameters of the orbital modulation of the emission lines' radial velocities.
Lines	$\gamma$ ( $\rm km~s^{-1}$ )	K ( $\rm km~s^{-1}$ )	Phase (*)
H $_{\gamma}{ }$	+12.7 (1.4)	66.5 (2.0)	0.003 (0.030)
H $_{\beta }$	+10.6 (0.4)	67.4 (0.6)	0.000 (0.009)
HeII( 4686 Å)	-14.7 (0.9)	42.2 (1.2)	0.024 (0.029)
HeII( 5411 Å)	-34.2 (5.2)	33.5 (7.4)	0.021 (0.220)
H $_{\alpha }{ }$	-22.8 (0.4)	74.8 (0.6)	0.0 (fixed)

* Phase of the blue-to-red zero crossing.
1- $\sigma$ error bars into parentheses.

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