NH₃ moment-zero map (grayscale; Busquet et al. 2013) overlaid on the magnetic field segments (red) and the intensity gradient vectors (green, uniform length) from dust continuum for Hub-N (upper panel) and Hub-S (lower panel). We have restricted the representation of the gradient to the areas where the emission exceeds three times the rms noise of the continuum map. White contours correspond to the SMA 1.3 mm dust continuum emission (Busquet et al. 2016), similar to Fig. 5. The orange lines depict the spine of the filaments identified in N₂H⁺ by Chen et al. (2019) and are labeled according to Busquet et al. (2013).