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Fig. A.2


PSF fitting test with a variable PSF and a complex, diffuse background. Left: point-source subtracted image after use of a variable PSF. Middle: residual image, after subtracting the input distribution of diffuse emission. Right: background as function of distance from Sgr A* as measured in the residual image. The grey scales are expressed in terms of σ deviations from the noise image.

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