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Table 1

Summary of X-ray source samples used in the text.

Sample Instrument Detections (UL) Redshift range Refs.

GRB-C1012 Swift 107 (11) 0.03–8.2 1, 2
AGN-E13 XMM-Newton 24 (34) 0.45–4.72 3
AGN-C11 XMM-Newton 40 (245) 0.02–2.39 4
AGN-Y09 XMM-Newton 32 (141) 0.22–5.41 5
AGN-hz XMM and Chandra 1 (15) 3.63–6.28 6, 7
AGN-P05 XMM-Newton 19 (44) 0.01–6.28 8

Reference. 1) Campana et al. (2010); 2) Campana et al. (2012); 3) Eitan & Behar (2013); 4) Corral et al. (2011); 5) Young et al. (2009); 6) Vignali et al. (2003); 7) Saez et al. (2011); 8) Page et al. (2005). Superposition of data were checked and older data were removed.

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