Panel a: spectra of each of the six Chandra observations (distinguished with different colors: blue, cyan, magenta, green, red, orange in chronological order), together with the best-fitting models (solid lines of the corresponding colors). The residuals are reported in the bottom panel. Panel b: physical model corresponding to the strongest spectrum in panel a (ObsID 6870). The single components are shown with the following color code: red for the absorbed vapec, thermal emission; blue for the absorbed zpowerlaw, primary X-ray emission; magenta for the pexrav, reflected continuum; green for the Gaussian emission line, fluorescent Fe I Kα at 6.4 keV. Ionized absorption barely affects the continuum and is omitted for clarity.
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