Residuals, plotted in terms of sigma with error bars of size one, for the XRT spectrum above 5.3 keV. The adopted model is an absorbed power law and a reflection component (Γ ~ 1.8, N_H ~ 2.4 × 10²²cm^-2, R ~ 1.1). An unabsorbed power law with ~2% of the intensity of the intrinsic power law accounts for the emission below ~1 keV (actually, below the reported energy interval). The centroid of the absorption line when one more Gaussian is included in the model is marked with a red vertical line (absorption line at E ~ 7.8 keV).