ALMA spectra obtained using int-CLEAN (black), Feather (dashed blue), and MACF (red) data combination methods. We display the (narrow) N₂H⁺ (1–0) (Top), HNC (1–0) (middle), and HC₃N (10–9) (bottom) spectra (rows) in three representative positions (columns) within the OMC-3 region (see Fig. A.1): (Left panels) (α, δ)=(05:35:19.6,-05:00:29.5), (central panels) (α, δ)=(05:35:25.5,-05:04:19.0), and (right panels) (α, δ)=(05:35:20.7,-05:01:11.9). Note how the filtering effects experienced in the int-CLEAN maps are unpredictable and change depending on position, velocity, and tracer consider in each case.