Table 2: Radial-velocity parameters for H $\alpha$ as derived by the analysis of the diagnostic diagram. Column 2 gives the FWHM of the Gaussians used for the diagram, Col. 3 the critical separation, Cols. 4 and 5 contain the resulting semi-amplitude and the error of the zero phase, respectively. The $\gamma$ parameter is not listed, as it reflects more the wavelength calibration process than a real physical parameter.
data set FWHM $d_{\rm max}$ $K_{\rm em}$ $\sigma(\varphi_0)$ Fig.

[Å] [Å] [km/s] [orbits]

AK Cnc 4 34 42(09) 0.036 A.1

WX Cet 4 52 59(18) 0.061 A.3

AQ Eri 2 44 36(09) 0.042 A.7

VW Hyi 4 40 38(09) 0.039 A.11

RZ Leo 1 4 66 49(13) 0.042 -

RZ Leo 2 4 62 51(15) 0.050 A.15

TU Men 2 48 84(09) 0.017 A.18

HS Vir 2 64 98(09) 0.017 A.20

**Table 2:** Radial-velocity parameters for H $\alpha$ as derived by the analysis of the diagnostic diagram. Column 2 gives the *FWHM* of the Gaussians used for the diagram, Col. 3 the critical separation, Cols. 4 and 5 contain the resulting semi-amplitude and the error of the zero phase, respectively. The $\gamma$ parameter is not listed, as it reflects more the wavelength calibration process than a real physical parameter.
data set	FWHM	$d_{\rm max}$	$K_{\rm em}$	$\sigma(\varphi_0)$	Fig.
	[Å]	[Å]	[km/s]	[orbits]
AK Cnc	4	34	42(09)	0.036	A.1
WX Cet	4	52	59(18)	0.061	A.3
AQ Eri	2	44	36(09)	0.042	A.7
VW Hyi	4	40	38(09)	0.039	A.11
RZ Leo 1	4	66	49(13)	0.042	-
RZ Leo 2	4	62	51(15)	0.050	A.15
TU Men	2	48	84(09)	0.017	A.18
HS Vir	2	64	98(09)	0.017	A.20

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