Do X-ray dark or underluminous galaxy clusters exist?

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Table 2

X-ray data.

ID	t_exp	obstot	obsbkg	nbox	C	log L_X
						erg s^-1

1	125.4	259	4079	33	40.41
2	4.3	35	269	22	41.49
3	8.9	457	356	51	41.73
4*	36.4	1223	1534	57	41.31
6	5.0	156	325	52	41.77
7	4.2	53	256	25	41.38
9	184.1	415	3827	10	39.67
10	3.8	59	190	41	41.80
11	94.1	231	4174	35	40.26
12	121.1	176	4509	63	40.63
13	149.3	150	4503	61	40.66
16	10.2	204	330	13	41.04
17	5.0	296	171	29	41.68
19	67.7	277	2326	34	40.59
20	4.4	567	188	10	41.30
21*	30.1	3522	2133	62	41.38
23	4.2	101	562	58	41.88
24	2.1	179	239	27	41.84
25	5.0	59	400	43	41.74
26	12.4	223	337	19	41.20
27	4.5	190	340	65	41.97
28	4.6	310	190	14	41.43
29	3.6	101	262	48	41.90
30	17.4	434	840	17	40.94
31	9.9	691	396	36	41.60
32	18.0	49	724	52	41.29
33	159.3	380	4650	61	40.80
34	7.8	38	468	77	41.72
35	89.9	144	2539	58	40.76
36	26.8	79	828	15	40.59
37	4.8	53	199	25	41.63
38*	12.9	3135	1257	76	41.80
39	81.2	412	3302	66	40.87
40	27.3	50	1098	28	40.91
42	6.3	33	387	98	42.13
43	2.9	96	198	96	42.51

Notes. Objects with an ID with an asterisc are not part of the statistical sample, because they are X-ray selected.

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