RELXILL fits of the high-energy edge of the iron line of the combined 2000 and 2017 data sets for the different inclination angles shown in Table A.1. The figure shows the 3−9 keV part of the spectrum. At lower angles, the model fits of the iron line are skewed toward the left side whereas at higher angles the fits display a linear tendency with a change in the slope. The models around the line resemble a broadened and asymmetric feature when the disk inclination lies, for instance, between 40 and 55°.