NH3(1,1) and (2,2) spectra produced by the core model at t = 3 × 105 yr (red curves) together with the observed spectra (histograms). The model over-predicts the observed intensities. The model agrees with observations at t = 105 yr and t = 2 × 106 yr. The intensities are given on the main-beam brightness temperature (TMB) scale.
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