Fig. 6
Scaling of the photon index versus normalization for NGC 4051 (red line – target source), and GRO J1655–40 and Cygnus X-1 (reference sources, green and black lines, respectively). Red triangles, black and blue squares correspond to RXTE, Suzaku and XMM-Newton data. Green squares and yellow-black circles correspond to RXTE data for GRO J1655–40 and Cygnus X-1, respectively.
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