NH₃ spectra of metastable lines at offset (0′′, 0′′) with respect to the reference positions given in Table 1 for W33 B1 (left panel). Nonmetastable lines from W33 Main1, W33 A1, and W33 B1 are shown in the right panel. Channel widths are 0.48, 0.48, 0.48, 0.47, 0.47, 0.46, and 0.44 km s⁻¹ for the NH₃ (1,1) to (7,7) lines, respectively, while the corresponding values for the NH₃ (2,1) and (3,2) lines are 0.49 and 0.50 km s⁻¹.