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Fig. 1
0.5−10 keV unabsorbed flux (in units of 10-9 erg cm-2 s-1; panel a)) and photon index of the best-fitting power law (panel b)) measured by the Swift-XRT in WT (blue points) and PC mode (red points), and by XMM-Newton (green point). JEM-X (panel c)) and ISGRI (panel d)) light curves were binned with a time resolution of 2 h.
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