Table 5: The close environments of the RQQsa.
Name z $N_{\rm r}$ $N_{\rm r}$
    (50 kpc) (100 kpc)
HS 0010+3611 0.530 0 0
1E 0112+3256 0.764 0 1
PB 6708 0.868 1 1
KUV 03086-0447 0.755 0 0
US 3828 0.515 1 1
MS 08287+6614 0.610 0 1
TON 392 0.654 0 1
US 971 0.703 0 0
HE 0955-0009 0.597 0 0
HE 1100-1109 0.994 0 3
CSO 769 0.850 0 0
HS 1623+7313 0.621 0 0
HS 2138+1313 0.810 2 3
LBQS 2249-0154 0.832 0 2
ZC 2351+010B 0.810 0 1
a Column (1) gives the name of the object; (2) the redshift of the object; (3) the number of companions within 50 kpc radius; (4) the number of companions within 100 kpc radius.

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