Multi-tracer diagram at the location of the main blue V-shape of G353 (Sect. 5.3). The different panels show the step by step construction of the final plot (right panel). Left panel: the black to white background shows the 1.3 mm continuum emission from Díaz-González et al. (2023). With black ellipses we show the 1.3 mm continuum cores from Louvet et al. (2024). With black text we indicate the IDs of the cores closest to the center of the V-shape, marked with a fuchsia “×”. We indicate the barycenter of cores 2 & 3 (see Fig. 11) with a yellow “×”. Filled contours represent the CO (2–1) emission in the velocity ranges of −50 km s⁻¹ to −15 km s⁻¹ (cyan) and 15 km s⁻¹ to 50 km s⁻¹ (beige), relative to the V_lsr = −17 km s⁻¹ of G353. With a white contour we indicate the log (N(H₂) cm²) = 23.3. Middle panel: in addition to the left panel, we include the SiO (5–4) emission with blue and red contours in the same (negative and positive) velocity range as with CO. The pink contour indicates the integrated intensity of the most blueshifted modeled N₂H⁺ Gaussian velocity component (see Fig. 9; blue distribution), at a value of 7 K km s⁻¹. Right panel: with open circles we show the location of the data composing the main N₂H⁺ blue V-shape. The colors indicate their velocity centroid, and their (increasing) size indicates how close the gas velocities are to the velocity apex of the V-shape. This VG seems to converge to the barycenter of cores 2 and 3, and it is oriented along filament “F3”.