σ_non map of the NH₃(1,1) main line shown as the colored background in the left panel. The dashed circular ring outlines the averaged regions used for the NH₃(1,1) and NH₃(2,2) spectra. The black contours show the 1.3 mm continuum with the same contour levels as those in Fig. 1. The black circle indicates the beam size of the 1.3 mm continuum observation, while the red circle denotes the beam size of the NH₃(1,1) line. Radial variation of σ_non from the center to the outer regions is marked in black in the right panel.