Time evolution of the power-law 0.3–10 keV unabsorbed luminosity (upper panel), apparent inner disk radius (middle panel; from the diskbb model in XSPEC, assuming a disk inclination of 45°) and Gaussian line flux (lower panel) obtained by fitting the available spectra with the same model as in Table 2. Spectra extracted from the full observation, flare, and quiescent time intervals are represented by black circles, red stars and blue squares, respectively. The time separations between the exposures performed during the same year have been enhanced for clarity.