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Fig. 2.


Swift/XRT spectra in 2011–2012 (red) and in 2018 (black), with their best-fit absorbed pexmon model shown as orange and dark gray lines, respectively (top panel) and the data-model ratios (bottom panel). They are corrected for the effective area of the instrument and are given in units of EFE (FE is the energy flux at the energy E).

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