Computed intensities of the rotational transitions of ortho‐ and para‐NH₃, plotted against the excitation energy of the emitting level, expressed relative to the energy of the J= 0 =K ground state of ortho; the intensity of the 572 GHz line of ortho‐NH₃, observed by Codella et al. (2010), is also plotted. See the text, Section 3.5.