Integrated intensity maps of NH₃ (1,1) (top) and (2,2) (bottom) lines. For NH₃ (1,1), the contour levels indicate 15σ,30σ, and 45σ, and for NH₃ (2,2), contours are shown for 6σ,12σ, and 18σ; where σ is the median error in emitted intensity calculated from the signal-free spectral range in each pixel and converted to the error in integrated intensity. The moment maps were improved by considering only the spectral range containing emission, as described in Sect. 4.1. The 1′ beam, which the data was convolved to, is shown in green in the bottom-left corner, and the scale bar is shown in the bottom-right corner.