The broadband cosmic XRB spectrum. The thick, solid, dark blue curve and the thin, solid, black curve show the total AGN spectrum and the contribution of Compton-thick (mildly+heavily) AGNs in the GCH07 model, respectively. The thick, dashed, dark blue curve and the thin, dashed, black curve are as above, but assume a 4 times larger abundance of heavily Compton-thick AGNs. The XRB measurements from various mission/instrument combinations are marked by different symbols as labeled. Labels on the left (right) generally refer to measurements at E< 10 (>10) keV. The relevant references are as follows. ASCA GIS: Kushino et al. (2002); ASCA SIS: Gendreau et al. (1995); ROSAT: Georgantopoulos et al. (1996); BeppoSAX/MECS: Vecchi et al. (1999); XMM(2002): Lumb et al. (2002); XMM(2004): De Luca et al. (2004); RXTE: Revnitsev et al. (2003); Swift/XRT: Moretti et al. (2009); Nagoya balloon: Fukada et al. (1975); SMM: Watanabe et al. (1997); HEAO-1: Gruber et al. (1999; open circles and filled triangles), Kinzer et al. (1997; hatched area); BeppoSAX/PDS: Frontera et al. (2007); INTEGRAL (2007): Churazov et al. (2007); INTEGRAL (2010): Turler et al. (2010); Swift/Bat: Ajello et al. (2008).
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