Panel a: Mean velocity (moment 1) map of NH₃(1-1) from the VLA 22GHz observations (Lu et al. 2018) overlaid with contours of ALMA 1.3 mm continuum emission. The F1, F2 and hub regions have roughly coherent velocities. Panel b: Rotation temperature map derived from NH₃(1-1) observations by the VLA. Panel c: NH₃(1-1) line width map. The black contours are at [2, 5, 10, 20, 40, 80, 160] × σ_{1.3 mm} (σ_{1.3 mm} = 0.1 mJy beam^-1) and have been smoothed for better visualization. The synthesized beam of O.71″ × O.59″ and a 0.1 pc scale bar are shown in the lower left and lower right corners, respectively.