Histogram of the NIR flux densities from Sgr A* observed in the K_s-band with NACO at ESO’s VLT (adapted from Fig. 3 of Witzel et al. 2012). Top panel: the solid line is the normalized distribution of the NIR flux densities corrected from the background emission. The dashed lines are the amplitude of the HST flares I, II and the lower limit of the amplitude of the flare III extrapolated to the K_s-band. We also represented the amplitude above the 3σ limit of the VLT flares IV and V extrapolated to the K_s-band. The dot-dashed line is the detection limit corresponding to 3 times the standard deviation of the quiescent flux density of HST on 2014 Mar. 10. Bottom panel: the cumulative distribution function of the NIR flux densities from Sgr A* corrected from the background emission.