Fig. 6.
Joint XMM-Newton-NuSTAR spectra with respect to a power-law modelling in the 3–10 keV band. A remarkable soft excess rises smoothly below 2–3 keV above the extrapolated 3–10 keV power law in all the observations. Moreover, it exhibits strong variability. In the Fe K energy band, a strong emission line is apparent, while in hard X-rays, residuals show a Compton hump.
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