Position of NH₂D cores on CCH integrated intensity map (left). Red crosses mark the NH₂D cores that have two velocity components, and cyan crosses mark those of one velocity component. Relation of NH₂D cores with CCH and H¹³CO⁺ emission (right), shown as position-velocity diagram. The three panels are position-velocity cuts along the shaded bands U, M, and L in left figure. Peak velocities along the spatial offset for different lines are shown as dashed or solid lines with respective colours (H¹³CO⁺: magenta, SiO: black, CCH: blue). Background colour scale shows the PV diagram of CCH (in upper panel) and SiO (in lower panel). NH₂D cores with two velocity components are marked as green X and three-branched triangles, and those with only one velocity component are shown as red diamonds. NH₂D cores that have σ_v>0.85 km s⁻¹ are marked with an additional hollow circle around the aforementioned markers.