Fig. 1.
Upper left: deep image after combining all 2012 Ks exposures with the holography technique. Lower left: deep image after combining all 2012 Ks exposures with the SSA technique. The insets on the right hand side show magnifications of the areas marked by the green squares. Colour scales are logarithmic. The axes mark offsets from Sgr A* along Right Ascension and Declination in arcseconds.
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