Table 5: Number and percentage of radio quiet and radio loud X-ray detected QSOs in the Véron-Cetty & Véron catalogue. Columns 1 and 2: $O_{\rm USNO}$ range, Col. 3: number of QSOs, Col. 4: number of sources brighter than 0.02 count s^-1 in the ROSAT catalogues, Col. 5: percentage of ROSAT detected QSOs; Col. 6 to 8: the same for the radio loud QSOs.
Radio quiet Radio loud

$O_{\rm min}$ $O_{\rm max}$ n $n_{\rm X}$ % n $n_{\rm X}$ %

<15.5 80 58 72 9 7 78

15.5 16.0 90 48 53 21 17 81

16.0 16.5 243 101 42 49 37 76

16.5 17.0 433 144 33 99 60 61

17.0 17.5 679 101 15 172 77 45

17.5 18.0 900 60 7 201 59 29

18.0 18.5 977 23 2 169 41 24

18.5 19.0 1040 13 1 107 11 10

19.0 19.5 475 4 1 41 5 12

19.5 20.0 87 0 0 18 5 28

**Table 5:** Number and percentage of radio quiet and radio loud X-ray detected QSOs in the Véron-Cetty & Véron catalogue. Columns 1 and 2: $O_{\rm USNO}$ range, Col. 3: number of QSOs, Col. 4: number of sources brighter than 0.02 count s^-1 in the ROSAT catalogues, Col. 5: percentage of ROSAT detected QSOs; Col. 6 to 8: the same for the radio loud QSOs.
	Radio quiet	Radio loud
$O_{\rm min}$	$O_{\rm max}$	n	$n_{\rm X}$	%	n	$n_{\rm X}$	%
	<15.5	80	58	72	9	7	78
15.5	16.0	90	48	53	21	17	81
16.0	16.5	243	101	42	49	37	76
16.5	17.0	433	144	33	99	60	61
17.0	17.5	679	101	15	172	77	45
17.5	18.0	900	60	7	201	59	29
18.0	18.5	977	23	2	169	41	24
18.5	19.0	1040	13	1	107	11	10
19.0	19.5	475	4	1	41	5	12
19.5	20.0	87	0	0	18	5	28

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