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Fig. 1

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Example of PSF reconstruction of one object, shown in logarithm scale. Panels show the PSF of each observation in the energy of 1 keV and 2 keV, except for the last four panels (panels A, B, C, and D). Panels A and B are the combined PSF weighted with exposure map in 1 keV and 2 keV, separately. In panel C, the PSF image in 1 keV and the PSF image in 2 keV are combined. Panel D shows the combined PSF image multiplied by the source count, as the final PSF image.

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