G353 N₂H⁺ isolated component S/N map. The white contour indicates the location of data with an isolated component S/N ≥ 5. We show the location of the 1.3 mm cores presented in Louvet et al. (2024) with black ellipses and are located in regions with S/N ≥ 15. We indicate the beam size of these data with a gray ellipse at the bottom left corner. Outside the S/N contour we make a rough extraction of the isolated component (see text). For data inside the S/N contours, we implement a procedure based on detection of peaks and valleys, to individually extract high (≥5) S/N isolated components (see Sect. 3).