Regions examined in Perseus, chosen to cover areas with similar numbers of counts in the Fe-K complex. (Left panel) Regions plotted on the fractional difference in 0.5 to 2.0 keV surface brightness from the average at each radius. Region 22 overlaps with other regions as it covers the outer Hitomi pointing. (Top-right panel) Fe-K count map, showing the number of counts in each 3.2 arcsec pixel in the Fe-K complex (6.50 to 6.90 keV, restframe), after subtracting neighbouring scaled continuum images (6.06 to 6.43 and 6.94 to 7.16 keV, restframe). Gaussian smoothing of σ = 4 pixels was applied. (Bottom-right panel) Exposure map, plotting the total Fe-K exposure (log s) excluding the Cu hole and accounting for vignetting.