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Fig. 4


Adjacent channel maps of the clump detected at 2.4′′ (9.1 pc) from the centre. The contours are represented with a step of 3.2 mJy/beam, namely 3.2, 6.4 9.6, 12.8, and 16 mJy/beam. The cross indicates the position of the optical centre. If it is not an outlier, seen close to the centre only in projection, it lies inside the sphere of influence of the black hole.

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