Fig. 6
Q-branch NH3 rovibrational spectra of IK Tau. These transitions connect the lower energy levels of the ground-state inversion doublets and the upper levels in the vibrationally excited state. Black lines show the observed spectra from the NASA IRTF and red lines show the modelled spectra. Each modelled spectrum was divided by a smoothed version of itself as in the real data (see Sect. 3.4) in order to induce the similar distortion in the line wings.
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