Zoom onto Sgr A* at 8.6   μm in the image reconstructed with the speckle holography algorithm from all burst mode observations in 2007. North is up and East is to the left. Contour lines are identical to the ones in Fig. 2. Sgr A* is marked with a cross of 0.075″ line segments. Upper left panel: estimate of the diffuse background emission at the position of Sgr A*. A point source of 5, 10, and 15 mJy was subtracted from the original reconstructed image at the position of Sgr A* with the results shown in the upper right, lower left, and lower right panels, respectively.