Fig. 4.
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Log-parabola photon index α versus the 3–7 keV flux of the orbit-wise NuSTAR observations. The parameter α is fitted after fixing spectral curvature β = 0.22 in the log-parabolic model. Each day is plotted with a different colour. The black line represents a linear fit, while the grey area is its uncertainty. The resulting slope is −0.46 ± 0.01.
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