Figure illustrating the steps defining the masks used in this paper for source AG024.4616+0.1981 for the continuum and for the moment-0 of H₂CO 3_0,3−2_0,2. Upper row: continuum mask_comp.; middle row: steps for the creation of continuum mask_ext.; bottom row first two panel from left: steps for the creation of the mask on moment-0; bottom row last two panel on the right: intersection masks used for the analysis.