Fig. 4
The surroundings of Sgr A* seen with NaCo in the M′-band. Upper left: average image from 2003 data. Upper right: average image from 2004 data. Lower left: average image from 2006 data. Lower right: average image from 2003–2006 data. Sgr A* is marked with a red cross. The fast-moving star S2 is marked in the 2003, 2004, and 2006 images. The gray scale is logarithmic.
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