Fig. 7
Hard X-ray flux (E> 3 keV) versus the photon index for the 3–10 keV (red circle), 10–20 keV (blue stars) and 20–50 keV (green squares) using the RXTE observations of BL Lac (1997–2001). Soft X-ray flux (0.3–2.5 keV) versus the photon index is plotted in the incorporated panel (top right) using Suzaku and Swift observations (see also Tables 4, 5).
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