Application of getsf to the Herschel surface density (13.5″ resolution) of the starless core L 1689B, embedded in a filament, adopting {X|Y}_λ = {90, 180}″. The top row shows the original hires image 𝒟_13″ obtained from Eq. (8) and the backgrounds ℬ_λ{X|Y} of sources and filaments. The middle row shows the component 𝒮_λ, the footprint ellipses of 12 acceptably good sources on 𝒮_λD, and the component ℱ_λD with one skeleton 𝒦_k2 corresponding to the scales S_​k ≈ 200″. The bottom row shows the standard deviations 𝒰_λ in the regularized component 𝒮_λR, the flattening image 𝒬_λ, and the standard deviations in the flattened component . Surface densities (in N_H2 cm⁻²) are limited in range with logarithmic color mapping, except for 𝒬_λ, which is shown with linear mapping.