SED models for the quiescent or mean emission from Sgr A*. Top: RIAF model by Yuan et al. (2004). Middle: jet-ADAF model by Yuan et al. (2002). Bottom: SED from a general relativistic magnetohydrodynamics simulation by Mościbrodzka et al. (2009, their “best-bet” model is shown), where the thin line is the average SED and the thick line represents the SED at a given moment during the simulations. The upper limit at 8.59   μm is indicated by a down-pointing red arrow, the mean flux densities at 4.8, 3.8 and 2.1   μm are shown as red dots with error bars, which correspond to the standard deviation of the observed variability between epochs. For details on the models and radio/mm/X-ray data, see the referenced publications.