Map of rotation temperature (Trot, left panel) and NH3 total column density (N(NH3), right panel) derived from the NH3 (2, 2)-to-(1, 1) ratio as described in Sect. 3.3.1. In left panel, contour levels (dotted lines) range from 11 K to 20 K in steps of 3 K, while they range from 4 × 1014 cm-2 to 3.2 × 1015 cm-2 in steps of 4 × 1014 cm-2 in the right panel. Crosses and solid contours indicate the millimetre continuum cores and the N2D+ cores, respectively, as in Figs. 1 and 3. In both panels, the ellipse in the bottom left corner shows the VLA synthesised beam.
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