Spectral evolution versus the soft photon index Γ₁. Top panel: correlations of the 5−10 keV/1−5 keV hardness versus Γ₁. We define the hard state (HS), the hard intermediate state (HIMS), the soft intermediate state (SIMS), and the soft state (SS) with Γ₁ values. Middle panel: ratio of unabsorbed energy flux of the disk components over the total energy flux versus Γ₁. Bottom panel: intensity of reflection that is denoted by the equivalent widths of the iron Kα lines, and is stronger in the soft state than in the harder state.