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Fig. 2

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(Left) a front-end view of one of the EPIC mirror modules containing the 58 co-axial mirrors shells, and the spider support structure used to hold the shells. (Right) the MOS2 PSF of the severely piled-up source GX 339-4 (ObsID 0204730301, revolution 783), showing the various PSF and other features (see text) − bad columns on the CCD are also visible as dark vertical lines.

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