Upper panel: photon index measurements for the six XMM intervals (X1-X6) in the 0.5−2 keV (filled circles) and the 2−7 keV (open squares) bands for PID 319. In X2-X5, the measured Γ differ significantly between the soft and hard bands, suggesting the presence of spectral break around 2 keV. Lower-left: photon indices measured for the 0.5−2 keV continuum plotted against the measured flux in the same band for the six XMM intervals. Lower-right: same as the left panel but in the 2−7 keV band. The fluxes are in units of 10^-14 erg s^-1 cm^-2.