First two panels from the top show the source lightcurves of Fig. 2 rebinned adaptively to a S/N = 9 (based on the lightcurve in the 0.3−3.5 keV energy band). The third panel from the top shows the HR, calculated as the ratio between the source count-rate in the 3.5–12 keV vs. count-rate in the 0.3–3.5 keV energy band. The other three panels show the absorption column density (N_H), the power-law photon index (Γ), and the observed flux (units of 10^-11 erg/cm²/s) in different time intervals as revealed from our time-resolved spectral analysis (see text for details).