Dependence of the 2–10 keV photon spectral index Γ of the Comptonized spectra from the sandwich corona (red filled symbols and left axis) and of the coronal temperature kTe (blue open symbols and right axis) on the ionization parameter for various coronal optical depths. Circles, squares, and triangles correspond to τT = 0.2, 0.4, and 0.8, respectively. The shaded area represents the typical observed range for Γ (1.6–1.8) and kTe (50–120 keV) (Wardziński et al. 2002; Zdziarski & Gierliński 2004; Ibragimov et al. 2005; Torii et al. 2011; Burke et al. 2017).
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