Table 1: The XMM- Newton fields used for the selection of the HBS28 sample.
obsid position (J2000) t $r_{\rm i}$ $r_{\rm o}$ obsid position (J2000) t $r_{\rm i}$ $r_{\rm o}$

(s) ( $^\prime$ ) ( $^\prime$ ) (s) ( $^\prime$ ) ( $^\prime$ )

0125310101 00 00 30.4 -25 06 43.4 19163.6 1 13 0067340101 18 55 37.1 -46 30 57.6 10653.3 0 11

0101040101 00 06 19.7 +20 12 22.8 34046.5 8 13 0081341001 19 31 21.7 -72 39 13.3 15288.1 1 13

0127110201 00 10 31.2 +10 58 40.7 7558.3 2 13 0081340501 20 13 30.0 -41 47 25.7 19196.8 0 13

0111000101 00 18 33.0 +16 26 08.0 31363.7 3 13 0111180201 20 40 10.0 -00 52 14.7 16495.8 8 13

0001930101 00 26 06.8 +10 41 12.5 18033.7 1 13 0111510101 20 41 50.9 -32 26 19.8 15046.1 8 13

0050140201 00 26 35.9 +17 09 37.8 50383.0 3 13 0130720201 20 44 09.0 -10 43 11.2 5312.0 8 13

0065770101 00 32 47.0 +39 34 33.3 7360.3 1 13 0111420101 20 45 09.4 -31 20 36.6 43323.5 8 13

0125320701 00 50 03.0 -52 07 36.7 16525.7 1 13 0112600501 20 46 20.0 -02 48 48.4 10550.3 8 13

0110890401 00 57 20.0 -22 23 04.1 29743.3 8 13 0083210101 20 54 18.8 -15 55 38.2 10435.5 2 13

0112650401 01 04 24.0 -06 24 10.6 23697.1 0 13 0112190601 20 56 21.6 -04 37 59.4 16639.4 2 13

0103861601 01 05 16.4 -58 26 10.4 7127.5 8 13 0081340401 20 58 27.1 -42 38 56.9 15002.3 1 13

0101040201 01 23 46.0 -58 48 25.8 28995.6 8 13 0041150101 21 04 11.1 -11 21 40.0 38736.2 1 13

0109860101 01 25 33.4 +01 45 38.2 38535.6 4 13 0038540301 21 04 40.2 -12 20 05.6 14698.6 2 13

0112600601 01 27 32.1 +19 10 32.3 3994.4 8 13 0088020201 21 27 38.1 -44 48 38.5 16094.7 1 13

0084230301 01 31 53.7 -13 36 56.4 20447.4 8 13 0103060101 21 29 12.2 -15 38 34.7 22042.9 3 13

0032140401 01 40 12.1 -67 48 40.3 7611.1 0 13 0109463501 21 37 56.5 -43 42 19.8 7577.7 2 13

0093641001 01 43 01.7 +13 38 24.4 9329.0 4 13 0061940201 21 38 07.9 -42 36 06.6 4868.2 1 13

0101640201 01 59 50.2 +00 23 46.8 7543.7 8 13 0008830101 21 40 15.5 -23 39 32.1 13986.7 2 13

0084140101 02 08 38.2 +35 23 00.2 38003.5 2 13 0103060401 21 51 55.9 -30 27 43.5 24072.9 3 13

0112371701 02 17 12.4 -04 39 04.2 20002.1 0 11 0124930201 21 58 52.9 -30 13 28.8 36246.3 8 13

0112371001 02 18 00.3 -04 59 47.8 50802.9 0 11 0130920101 22 03 09.3 +18 52 27.9 16491.3 1 13

0112371501 02 18 48.3 -04 39 02.9 6684.6 0 11 0012440301 22 05 10.1 -01 55 11.2 30937.5 2 13

0112370301 02 19 36.3 -04 59 47.7 50386.7 0 11 0106660101 22 15 31.9 -17 44 02.6 56911.8 1 13

0098810101 02 36 12.3 -52 19 55.6 23451.5 2 13 0009650201 22 17 55.4 -08 20 58.0 21027.5 8 13

0075940301 02 36 57.9 +24 38 53.7 47428.9 8 13 0049340201 22 20 45.1 -24 40 58.1 26842.3 6 13

0067190101 02 38 19.4 -52 11 34.1 25628.7 3 10 0018741701 22 34 32.9 -37 43 48.1 7080.3 4 13

0111200101 02 42 41.1 -00 00 53.7 35486.8 8 13 0111790101 22 35 45.9 -26 03 00.4 41304.4 4 13

0111490401 02 48 43.8 +31 06 59.2 31030.1 8 13 0103860201 22 36 55.9 -22 13 10.1 8489.9 8 13

0056020301 02 56 32.8 +00 06 01.7 17251.4 2 13 0006810101 22 42 39.5 +29 43 35.6 7009.4 8 13

0041170101 03 02 38.5 +00 07 31.9 47278.1 0 13 0109070401 22 48 41.5 -51 09 57.9 14722.6 8 13

0042340501 03 07 03.8 -28 40 24.1 13285.7 4 13 0112240101 22 49 48.3 -64 23 11.2 30608.4 8 13

0122520201 03 11 59.3 -76 51 53.0 28296.4 2 13 0081340901 22 51 49.4 -17 52 17.0 22398.6 1 13

0110970101 03 13 09.6 -55 03 48.4 10240.0 0 13 0112910301 22 53 58.8 -17 33 55.8 5301.3 8 13

0105660101 03 17 56.0 -44 14 15.1 23151.9 6 13 0112170301 23 03 15.8 +08 52 25.9 23349.6 4 13

0108060501 03 32 29.1 -27 48 27.1 46835.8 0 13 0109130701 23 04 43.6 -08 41 14.5 10615.6 8 13

0099010101 03 35 27.6 -25 44 54.5 18777.9 8 13 0033541001 23 04 45.0 +03 11 35.6 12461.5 2 13

0055140101 03 39 35.0 -35 25 58.1 47637.0 1 11 0123900101 23 13 58.9 -42 43 28.3 37401.3 6 13

0111970301 04 09 07.2 -71 17 43.9 18741.3 8 13 0109463601 23 15 18.7 -59 10 31.7 5403.6 8 13

0112600401 04 25 44.2 -57 13 34.4 7627.3 8 13 0112880301 23 31 49.9 +19 56 28.5 14318.0 3 13

0103861701 04 35 17.1 -78 01 54.3 8010.9 8 13 0093550401 23 33 40.0 -15 17 12.2 22258.0 1 13

0112880401 04 59 35.4 +01 47 16.0 18915.3 2 13 0100241001 23 49 40.6 +36 25 30.6 8739.0 3 13

Column 1: observation ID; Col. 2: sky position of the center of the field; Col. 3: MOS2 exposure time (after having removed the time intervals characterized by a high background); Col. 4: inner radius (see text for details); Col. 5: outer radius (see text for details).

**Table 1:** The XMM- *Newton* fields used for the selection of the HBS28 sample.
obsid	position (J2000)	t	$r_{\rm i}$	$r_{\rm o}$	obsid	position (J2000)	t	$r_{\rm i}$	$r_{\rm o}$
		(s)	( $^\prime$ )	( $^\prime$ )			(s)	( $^\prime$ )	( $^\prime$ )
0125310101	00 00 30.4 -25 06 43.4	19163.6	1	13	0067340101	18 55 37.1 -46 30 57.6	10653.3	0	11
0101040101	00 06 19.7 +20 12 22.8	34046.5	8	13	0081341001	19 31 21.7 -72 39 13.3	15288.1	1	13
0127110201	00 10 31.2 +10 58 40.7	7558.3	2	13	0081340501	20 13 30.0 -41 47 25.7	19196.8	0	13
0111000101	00 18 33.0 +16 26 08.0	31363.7	3	13	0111180201	20 40 10.0 -00 52 14.7	16495.8	8	13
0001930101	00 26 06.8 +10 41 12.5	18033.7	1	13	0111510101	20 41 50.9 -32 26 19.8	15046.1	8	13
0050140201	00 26 35.9 +17 09 37.8	50383.0	3	13	0130720201	20 44 09.0 -10 43 11.2	5312.0	8	13
0065770101	00 32 47.0 +39 34 33.3	7360.3	1	13	0111420101	20 45 09.4 -31 20 36.6	43323.5	8	13
0125320701	00 50 03.0 -52 07 36.7	16525.7	1	13	0112600501	20 46 20.0 -02 48 48.4	10550.3	8	13
0110890401	00 57 20.0 -22 23 04.1	29743.3	8	13	0083210101	20 54 18.8 -15 55 38.2	10435.5	2	13
0112650401	01 04 24.0 -06 24 10.6	23697.1	0	13	0112190601	20 56 21.6 -04 37 59.4	16639.4	2	13
0103861601	01 05 16.4 -58 26 10.4	7127.5	8	13	0081340401	20 58 27.1 -42 38 56.9	15002.3	1	13
0101040201	01 23 46.0 -58 48 25.8	28995.6	8	13	0041150101	21 04 11.1 -11 21 40.0	38736.2	1	13
0109860101	01 25 33.4 +01 45 38.2	38535.6	4	13	0038540301	21 04 40.2 -12 20 05.6	14698.6	2	13
0112600601	01 27 32.1 +19 10 32.3	3994.4	8	13	0088020201	21 27 38.1 -44 48 38.5	16094.7	1	13
0084230301	01 31 53.7 -13 36 56.4	20447.4	8	13	0103060101	21 29 12.2 -15 38 34.7	22042.9	3	13
0032140401	01 40 12.1 -67 48 40.3	7611.1	0	13	0109463501	21 37 56.5 -43 42 19.8	7577.7	2	13
0093641001	01 43 01.7 +13 38 24.4	9329.0	4	13	0061940201	21 38 07.9 -42 36 06.6	4868.2	1	13
0101640201	01 59 50.2 +00 23 46.8	7543.7	8	13	0008830101	21 40 15.5 -23 39 32.1	13986.7	2	13
0084140101	02 08 38.2 +35 23 00.2	38003.5	2	13	0103060401	21 51 55.9 -30 27 43.5	24072.9	3	13
0112371701	02 17 12.4 -04 39 04.2	20002.1	0	11	0124930201	21 58 52.9 -30 13 28.8	36246.3	8	13
0112371001	02 18 00.3 -04 59 47.8	50802.9	0	11	0130920101	22 03 09.3 +18 52 27.9	16491.3	1	13
0112371501	02 18 48.3 -04 39 02.9	6684.6	0	11	0012440301	22 05 10.1 -01 55 11.2	30937.5	2	13
0112370301	02 19 36.3 -04 59 47.7	50386.7	0	11	0106660101	22 15 31.9 -17 44 02.6	56911.8	1	13
0098810101	02 36 12.3 -52 19 55.6	23451.5	2	13	0009650201	22 17 55.4 -08 20 58.0	21027.5	8	13
0075940301	02 36 57.9 +24 38 53.7	47428.9	8	13	0049340201	22 20 45.1 -24 40 58.1	26842.3	6	13
0067190101	02 38 19.4 -52 11 34.1	25628.7	3	10	0018741701	22 34 32.9 -37 43 48.1	7080.3	4	13
0111200101	02 42 41.1 -00 00 53.7	35486.8	8	13	0111790101	22 35 45.9 -26 03 00.4	41304.4	4	13
0111490401	02 48 43.8 +31 06 59.2	31030.1	8	13	0103860201	22 36 55.9 -22 13 10.1	8489.9	8	13
0056020301	02 56 32.8 +00 06 01.7	17251.4	2	13	0006810101	22 42 39.5 +29 43 35.6	7009.4	8	13
0041170101	03 02 38.5 +00 07 31.9	47278.1	0	13	0109070401	22 48 41.5 -51 09 57.9	14722.6	8	13
0042340501	03 07 03.8 -28 40 24.1	13285.7	4	13	0112240101	22 49 48.3 -64 23 11.2	30608.4	8	13
0122520201	03 11 59.3 -76 51 53.0	28296.4	2	13	0081340901	22 51 49.4 -17 52 17.0	22398.6	1	13
0110970101	03 13 09.6 -55 03 48.4	10240.0	0	13	0112910301	22 53 58.8 -17 33 55.8	5301.3	8	13
0105660101	03 17 56.0 -44 14 15.1	23151.9	6	13	0112170301	23 03 15.8 +08 52 25.9	23349.6	4	13
0108060501	03 32 29.1 -27 48 27.1	46835.8	0	13	0109130701	23 04 43.6 -08 41 14.5	10615.6	8	13
0099010101	03 35 27.6 -25 44 54.5	18777.9	8	13	0033541001	23 04 45.0 +03 11 35.6	12461.5	2	13
0055140101	03 39 35.0 -35 25 58.1	47637.0	1	11	0123900101	23 13 58.9 -42 43 28.3	37401.3	6	13
0111970301	04 09 07.2 -71 17 43.9	18741.3	8	13	0109463601	23 15 18.7 -59 10 31.7	5403.6	8	13
0112600401	04 25 44.2 -57 13 34.4	7627.3	8	13	0112880301	23 31 49.9 +19 56 28.5	14318.0	3	13
0103861701	04 35 17.1 -78 01 54.3	8010.9	8	13	0093550401	23 33 40.0 -15 17 12.2	22258.0	1	13
0112880401	04 59 35.4 +01 47 16.0	18915.3	2	13	0100241001	23 49 40.6 +36 25 30.6	8739.0	3	13

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