**Table 4:** The black hole masses of the RQQs^a.
Object	$M_{\rm BH}/10^{9}~M_{\odot}$
HS 0010+3611	0.5
1E 0112+3256	1.3
PB 6708	<0.7
KUV 03086-0447	2.0
US 3828	0.5
MS 08287+6614	0.7
TON 392	1.3
US 971	0.4
HE 0955-0009	<0.9
HE 1100-1109	2.2
CSO 769	1.1
HS 1623+7313	0.3
HS 2138+1313	<1.0
LBQS 2249-0154	1.2
ZC 2351+010B	0.5

^a Transformations of magnitudes to R-band
done assuming R-H = 2.5.

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