Fig. 5
Chandra photon counts expected in the 5–10 keV energy range as a function of the hydrogen column density (NH), for a photon index of Γ = 1.4 (bottom curve), 1.8 (middle curve), and 2.2 (top curve). These extrapolations of the ISGRI observations are based on a power-law model that includes interstellar photoelectric absorption (wabs*powerlaw).
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