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-hz||XMM and Chandra||1 (15)||3.63–6.28||6, 7|
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