From left to right and top to bottom, the contours are the integrated intensity (zeroth moment) maps of NH₃ (1, 1) with side lengths of 11′, 9′, 7′, 5′, and 3′ respectively. These images are all centered at the red cross in OMC-2 illustrated in the right panel of Fig. 2. The integration range of each panel is 6.5 < VLSR < 12.5 km s⁻¹. Contours start at 0.96 K km s⁻¹ (4σ) and go up in steps of 0.96 K km s⁻¹. The spectra (black) overlaid with their fitting curves (green) are the averaged spectra within the regions corresponding to their upper panels.