Integrated intensity map of NH₂D line emission of clumps MM2, MM3, and C (colourscale, of velocity range 80–115 km s^–1) are shown in the upper-left panel and marked with locations of NH₂D cores by crosses of different colours. The orange crosses indicate the cores which have a σ_v>0.85 km s^–1 velocity components and magenta crosses represent cores that only have narrow velocity components, σ_v≲0.5 km s^–1. Integrated intensity map of CH₃OH 2(0,2)–1(0,1) line (colourscale, of velocity range 85– 100 km s^-1 ) overlaid by contours of n(H₂) map (green) shown in the upper-right panel. In both plots, the blue crosses mark the position of the peak intensity of the 3 mm continuum of clumps MM2 and MM3. Lower panels: same as the upper panels, but for the clumps F1 and F2. In both plots, the blue crosses mark the position of the three cores in the 3 mm continuum of clump F1 (as in Fig. 2, right panel).