Fig. 3.

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Models and residuals for the two setups assumed in the spectral analysis. Top row: two different setups are shown, adopting the ABSPL model as an example. Left panel: refers to setup A, in which the spectral parameters are the same for all the data sets (labeled with different colors), modulo a normalization constant that encapsulates the nuclear flux variability of the hard X-ray emission alone. Setup B is shown in the right panel, for which the diversity in spectral slope, column density and normalization can be appreciated. Bottom row: data vs. model residuals, as fit with the setup A (left panel), and B (right panel). From top to bottom: ABSPL, BORUS, and WARPDSK models, respectively.
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