Combination of the detection images 𝒮_λDjC (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 𝒮_DjC thresholded above ϖ_λSj = 5σ_​λSj and combined over all wavebands are shown. Several faint spurious peaks visible on large scales near edges in the bottom row are the background and noise fluctuations that happened to be stronger than the threshold. They may be discarded during the subsequent detection and measurement steps. Logarithmic color mapping.