Derived surface densities and temperatures (Sect. 3.1.2). The true model image 𝒟_C + 𝒟_S and the hires surface density 𝒟_13″ and temperature 𝒯_13″ derived from Eq. (8) with λ_H = 160 μm (O_H = 13.5″) are shown. Many of the sources, clearly visible in the true image (left), are not discernible in the derived surface density (middle) because of the inaccuracies in the temperatures from fitting spectral shapes Π_λ. Square-root color mapping, except the right panel with linear mapping.