Results of the scan of χ² statistical spaces between 5 and 11 keV with a Gaussian line. Top panels: confidence contours at (from the outermost to the innermost) 68%, 90%, 99%, and 99.9% significance levels for the centroid energy and normalization of a Gaussian emission or absorption line applied to the baseline model [(partcov*xstar500)*pow]. The contours are filled with a color intensity proportional to the Δχ² represented in the color map to the right of each panel. The three dashed vertical lines mark the rest-frame energy of Fe I, Fe XXV, and Fe XXVI Kα transitions. We note the different y-axes in the 2008A and 2008B panels. Bottom panels: observed spectra (filled circles) and corresponding background (shaded area).