Table 1: Mean heliocentric radial velocities derived from different ions compared to those derived by ZSW.
Ion $\varv_{\rm rad}$ $\varv_{\rm rad}^{\rm ZSW}$

(km s^-1) (km s^-1)

[Fe II] 156.9 141.0

[O I] 156.1 164.0

Si II 155.7 150.0

Fe II 159.9 144.0

Cr II 161.1 -

Balmer lines 152.8 143.0

H $\alpha^{\rm ca}$ 150.9 126.0

H $\alpha^{\rm bp}$ 110.0 70.0

H $\alpha^{\rm rp}$ 197.0 210.0

**Table 1:** Mean heliocentric radial velocities derived from different ions compared to those derived by ZSW.
Ion	$\varv_{\rm rad}$	$\varv_{\rm rad}^{\rm ZSW}$
	(km s^-1)	(km s^-1)
[Fe II]	156.9	141.0
[O I]	156.1	164.0
Si II	155.7	150.0
Fe II	159.9	144.0
Cr II	161.1	-
Balmer lines	152.8	143.0
H $\alpha^{\rm ca}$	150.9	126.0
H $\alpha^{\rm bp}$	110.0	70.0
H $\alpha^{\rm rp}$	197.0	210.0

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