Distribution of NH3 maser emission in W51-North imaged with the JVLA. Emission centroids of the (6, 6), (7, 7), and (9, 9) lines (filled triangles) are shown as a function of velocity in the left, middle, and right panels, respectively. Color denotes line-of-sight. velocity (color scale on the right-hand side). The size of the symbols scales logarithmically with the flux density. The size of the crosses represents the 1σ formal fitting error to the position of the emission in individual velocity channels. The positional offsets are from , δ(J2000) = 14°31′05.̋677. The linear spatial scale is given in the bottom right corner of the left panel.
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