Evolution of the key parameters measured via the spectral analysis as a function of time. The panels show (from a to g) the equivalent hydrogen column N_H of the neutral absorption, the optical depth τ of the additional silicon edge, the photon index Γ, the temperature at the inner edge of the disk T_in, the ionization degree log ξ of the accretion disk, the logarithmic number density of electrons of the accretion disk log N, and the reduced chi-squares χ_ν² of the best-fits. The red and blue dots denote parameters obtained in the soft state and hard decay phase, respectively.