0.3–0.4, 0.9–1, and 1.4–1.7 vs. 1.7–3 keV flux–flux plots (top, middle, and bottom rows, respectively) for Obs. 3, obtained with Δt_bin = 1,4, and 8 ks (left, middle, and right columns, respectively). The solid red line indicates the best-fit power-law relation to the “high-flux” data (see text for details). The vertical lines indicate the continuum band median. The best-fit residuals are plotted in the lower plan of each plot. Error bars are omitted in the residual plots for reasons of clarity.