Cumulative column density (N_H2) along line of sights, excluding ISM and diffuse envelope contributions. The maps show Sgr B2 models with fixed parameters α = 1.35, m_min = 10 M_⊙ and Sgr B2 mass-size relation, and two values of f_DGMF. The concentration of mass into small dense regions reduces the interclump density, as seen from the figures. In the case of f_DGMF = 0.8, we also show clump populations with mass-size relations tuned to obtain a volume-filling fraction of μ = 0.01 and μ = 0.1. At a distance to the centre of Sgr B2 of ~8000 pc, 1 arcmin corresponds to a size of ~2.3 pc.