Images of the detector in different fluorescent lines, created from stacked astrophysical observations. Shown are images in Cu-Kα (left; 7.805 to 8.285 keV), Ni-Kα (centre; 7.280 to 7.680 keV) and Cu-Kβ and Zn-Kα (right; 8.455 to 9.075 keV). Approximate background has been subtracted using scaled continuum images on either side of the lines. Some residual astrophysical emission can be seen in the centre of the image. The total exposure is around 64 Ms after cleaning for flares, combining both FF and EFF data and using PATTERN ≤ 4. The image was binned by 64 detector coordinate units and smoothed by a Gaussian of σ = 1 pixel width.