Table 6: Depth of the H $_{\alpha }$ line of the primary components of of some short-period RS CVn stars.
Star XY UMa SV Cam RT And BH Vir

$T_{{\rm eff}}$ (K) 5780 5800 6150 6100

$d_{{\rm obs}}$ 0.31 0.32 0.28 0.22

**Table 6:** Depth of the H $_{\alpha }$ line of the primary components of of some short-period RS CVn stars.
Star	XY UMa	SV Cam	RT And	BH Vir
$T_{{\rm eff}}$ (K)	5780	5800	6150	6100
$d_{{\rm obs}}$	0.31	0.32	0.28	0.22

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