Noise behavior of our data. (a) Comparison of the dynamic range we can reach between S2 and Sgr A* frames. The dynamic range is calculated as the ratio between the peak flux in each CLEANed image vs. the rms in the central 74 mas × 74 mas region on the residual map. (b) Distribution of the rms noise in all the Sgr A*-removed residual frames and S2 frames. (c) Distribution of the peak flux in all the Sgr A*-removed residual frames. For comparison, S62 has a relative brightness of 0.01. These numbers are normalized to S2 flux.