Composite X-ray image of the Perseus cluster (3 × 3 degrees, 2″ pixels) obtained by co-adding eROSITA all-sky data and pointed observations of Chandra and XMM-Newton. The images of individual telescopes were renormalized to have the same X-ray flux within the central 3′ circle as in the eROSITA 0.4–2.3 keV band. Radial weights have been applied to ensure that the sharpest Chandra images dominate within a central 3′. The inset is a zoomed version of the same image showing the central 1% of the image (in terms of the solid angle, i.e., 0.3 × 0.3 degrees) and the canonical cool-core design with an AGN (NGC 1275) and X-ray cavities inflated by the AGN.