First-moment maps (intensity-weighted peak velocities) for G28. Top: 30m observations. Bottom: merged NOEMA+30m data (except NH 2 D, which shows NOEMA-only data as that line was not covered by the 30m observations). All maps were created by clipping the data below the 3σ level. The contours on the 30 m data show 870 μm continuum (Schuller et al. 2009) in 3σ steps of 0.15 Jy beam⁻¹. The contours on the NOEMA+30m data show the NOEMA-only 3.6 mm continuum from 0.4 to 1.6 mJy beam⁻¹ (1σ ~ 0.1 mJy beam⁻¹). Molecules are labeled in all panels, and the beam and scale bar are shown in the top-left panels. The H¹³CO⁺ panels outline the west–east pv cut presented in Fig. 7.