Residuals of the fits of the three pn spectra in the 0.3–10 keV band with the BPL model (Sect. 3.2), for interval A (black), B (red), and C (green). Upper panel: simple broken power law. Middle panel: broken power law plus blackbody. Lower panel: broken power law plus blackbody and Gaussian line. The data were binned for plotting purposes.
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