Spectral energy distribution plots using a fixed beamsize of 30′′ . The orange solid line is the RADMC-3D dust and free-free best fit, the orange dotted line represents the free-free contribution, the dashed-dotted line represents the contribution from dust emission. The different dark blue markers represent the observational results from Goldsmith et al. (1990, 1992), as well as from Hi-GAL and WISE maps. The surface, where the dust optical depth equals one is plotted in olive, the corresponding axis is shown on the right. The z-axis points towards the observer, Sgr B2(M) is located at z = 0 and Sgr B2(N) is located at z = 7 × 105 au. A tau surface datapoint at −22.5 pc indicates that the dust is optically thin at the corresponding frequency.