Upper panels: count spectra and models in the 0.5–10 keV energy range for different epochs (black points and lines are Jan. 23, 2009, red for Jan. 25, 2009, green for Jan. 29, 2009, blue for Feb. 03, 2009, and magenta is Feb. 06, 2009). Left: BB+PL model. Right: NTZ model. Fit residuals are shown in the bottom panels. Lower panels: time evolution of the best-fitting parameters inferred from the BB+PL (left) and NTZ (right) fits of the 0.5 − 10 keV spectra. The 0.5–10 keV flux (in units of 10^-11   erg   cm^-2   s^-1) and the PF evolution are also shown.