Velocity distribution (moment 1) of NH₃ (1, 1) line overlaid with integrated-intensity contours (moment 0) of NH₂D line with velocity range covering all the six HfS lines. The contour levels start at − 3σ in steps of 3σ for NH₂D with σ_(a)-(h) = 60.3, 60.9, 51.1, 53.2, 84.1, 48.3, 49.0, 50.4 mJy beam⁻¹km s⁻¹. The synthesized beam sizes of each subfigure are indicated at the bottom-left corner. The dashed circle indicates the primary beam of the PdBI observations at 3.5 mm. The lines with arrows show the cutting direction in Fig. A.8.