NH₃ spectra of metastable lines at offset (0′′, 0′′) with respectto the reference positions given in Table 1 for W33 B (left panel). Nonmetastable lines from W33 Main, W33 A, and W33 B 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.