Synthetic column density images used to qualify the extraction of cores in images denoised by MnGSeg. Panel a) : Projected column density map of a numerical simulation by Ntormousi & Hennebelle (2019), from which simulated cores have been removed and to which synthetic sources have been added (0.2 − 3.2 M_⊙ cores with a I(θ) ∝ θ⁻¹ intensity profile up to 0.5′′). Panel b) : Simulation of the ALMA imaging of the column density map of a at 1.3 mm, with a 240-minutes integration time and a beam size of 0.81′′ × 0.76′′. Panel c) : Simulated ALMA image from b), with noise reduced by ~30% using MnGSeg. Cores are outlined by ellipses and labeled by numbers according to the truth table (in a)) and getsf identifiers in the original and denoised catalogs (in b) and c)).