Proper motions of infrared excess sources in the central 2′′ close to SgrA*. Offsets in RA and Dec in milliarcseconds are plotted against the time in years. Source labels and observing bands are given as indicated in Fig. 1 and Table 4. The source positions agree to within better than about ± 25 mas, i.e., a quarter of the L′-band beam. The motions obtained at different wavebands agree within the uncertainties. For sources for which S-star identifications are given, the positions and motions agree on average to within about 30 mas and 150 km s-1.
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