Fig. 6.

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Photon index Γ as a function of the X-ray Eddington ratio λX (λX = LX/LEdd). Yellow points, red diamonds, blue star, and purple triangle refer to the data analyzed in this work with the BORUS model and to archival ASCA, BeppoSAX, and Suzaku data, respectively. Black dashed lines are simple linear fits below and above the separation value of log λX = −5 (broadly corresponding to a canonical Eddington ratio of ≈10−4 for a bolometric correction on the order of 10), indicating two possible regimes.
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