Continuum images of the G28 IRDC. Color scale and solid contours showing the NOEMA 3 mm continuum emission. Contour levels range from 0.4 to 1.6 mJy beam^–1 (1σ  0.1 mJy beam⁻¹). The dotted contours show 870 μm single-dish continuum data (ATLASGAL, Schuller et al. 2009) starting at 0.15 Jy beam⁻¹ and continuing in steps of 0.3 Jy beam⁻¹ up to 1.5 Jy beam⁻¹ (1σ  0.05 Jy beam⁻¹ ). Middle: color scale showing the Spitzer 8 μm emission (2″ resolution, Churchwell et al. 2009) with 3 mm emission overlaid as contours. Right: color scale showing the 1.95 GHz continuum emission from the THOR survey (10.6″ × 9.0″ resolution, Beuther et al. 2016; Wang et al. 2020) with 3 mm emission overlaid as contours. All panels show a scale bar and the NOEMA synthesized beam. Source labels follow Carey et al. (2000), Wang et al. (2008); G28N and G28fil are newly labeled here.