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Fig. 2

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Combined EPIC PN, MOS 1 and MOS 2 RGB image of the Deep M 31 Survey including archival data. The optical extent of M 31 is indicated by the D25 ellipse and the boundary of the observed field is given by the green contour. The central region, marked with the yellow square, is shown in higher resolution in the upper right corner. For more details see Sect. 4.

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