Comparison of the ALMA continuum emission maps (left panels, see also Figs. 4 and 5) to synthetic images at 242 GHz (right panels) of the 3D radiative transfer model presented in Schmiedeke et al. (2016). The top panels show the emission toward Sgr B2(N), while the bottom panels show the emission toward Sgr B2(M). The synthetic images have been post-processed to the same uv sampling of the actual ALMA observations, adding thermal noise corresponding to a precipitable water vapor of 0.7 mm.