Inner area of M 31 enlarged from Fig. A.1. Contours are at (4,8,16,32,64,128,256) × 10-6 ct s-1 pix-1 including a factor of one smoothing. Sources from the large catalogue are marked as 30′′ × 30′′ squares. The images are ordered as follows: Centre 1 (upper left), Centre 2 (upper right), Centre 3 (middle left), Centre 4 (middle right) and Centre B (lower left).
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