Comparison of the NH₃ gas kinematic among the inversion lines from (2, 2) to (5, 5), as indicated in the top left with upper excitation energies. Each panel shows a first-moment map of a given line (colour map) with overplotted its moment zero contours. Moments are calculated over the same velocity range (see Fig. 1) and the velocity scale is quantified by the colour wedge in the top left panel. Positive contours start at 3 σ and increase by 1 σ of 2.6 mJy beam⁻¹ km s⁻¹; negative (dashed) contours start at −3 σ by steps of −2 σ. The first-moment maps are evaluated within the 4 σ contour of their moment zero map; the thick red contour draws the 3 σ contour of the NH₃ (5, 5) map for comparison with other lines. Same field of view and resolution as in Fig. 1 (beam size shown in the top-left panel).