Fig. 5.
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Correlation between time lag and photon index, Γ, for Cyg X–1 (left) and GX 339–4 (right). The data for Cyg X–1 come from Pottschmidt et al. (2003, see also Kylafis et al. 2008) and for GX 339–4 from Kylafis & Reig (2018). Black empty circles represent the observations, and the filled blue circles correspond to the models, which are produced with γ0 = 1.14 and the values of τ∥ and R0 that are shown in Fig. 6.
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