Emission centroids of NH₃ fitted as a function of velocity (open squares) and CH₃OH masers (filled circles) overlaid on the 1.3 cm continuum map (black image and white contours). Color denotes V_LSR (color scale on the right-hand side). The sizes of squares and circles scale linearly and logarithmically with the flux density of NH₃ and CH₃OH maser emission, respectively. The relative alignment between NH₃ and CH₃OH is accurate to ~30 mas. Note that NH₃ emission distributes between IRS1a and IRS1b, shows a velocity gradients roughly N–S, and is strongest towards IRS1a.