NH₂D integrated-intensity contours overlaid on a 3.5 mm continuum 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) = 60.4, 60.9, 51.1, 53.2, 33.6, 23.4, 26.9, 50.4 mJy beam⁻¹km s⁻¹. The green ellipses with red numbers indicate the positions of extracted NH₂D cores. The symbols “▴”, “■”, and “⋆” indicate thepositions of masers, H II regions, and infrared sources, respectively. 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.