Three-colour images of the clumps (red: GLOSTAR 5 cm radio continuum; green: Herschel Hi-GAL PACS 70 µm; blue: Spίtzer 8.0 µm), overlaid with contour levels of NOEMA 3 mm continuum emission (white contours) and N(H₂) (gray contours). The beams for the 3 mm continuum and the N(H₂) map (10″) are shown in bottom left corner. The outer yellow solid lines indicate the NOEMA fleld-oſ-view of the observations. Left: target clump C, MM2, and MM3. The UCHπ region (red cross) and OH maser (red circle), methanol masers (white three-branched triangles), and the northwestern substructure in clump MM2 (orange rectangle) are marked. Contour levels of the 3 mm continuum are logarithmic-spaced from 2σ_v (σ_v = 1.6 mJy beam⁻¹) to 225.0 mJy beam⁻¹ with five intervals. Contour levels of the N(H₂) map have values of log₁₀(N(H2)) = [22.75, 23.0, 23.25, 23.5] cm⁻². Right: target clump Fl and F2. Contour levels of 3 mm continuum are logarithmic-spaced from 2σ_v (σ_v = 0.4 mJy beam⁻¹) to 3.3 mJy beam⁻¹ with five intervals. The three compact sources are marked with yellow pluses. Contour levels of the N(H₂) map have values of 10^[22.4,22.7]cm⁻².