Combination of the detection images ℱ_ƛDjC (Sect. 3.4.2) for the set of images ℐ_​λ containing all Herschel wavebands and ℐ_ƛ ≡ 𝒟_13″ from Eq. (8). The clean ℱ_DjC thresholded above ϖ_λFj = 2σ_​λFj and combined over five wavebands are shown (excluding the noisier 70 and 100 μm images). The faint ring-like structures that are visible on some scales are the source residuals originating from the derived surface densities that have substantial inaccuracies over the sources (cf. Figs. 5 and 8; Appendix A). Square-root color mapping.