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Fig. 2

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Portion of the recorded spectrum at 731 GHz (P = 60 mTorr/8.0 Pa, frequency modulation = 1.2 MHz): the J = 55,1 ← 54,2 transition of HS and the J = 107,3 ← 106,4 transition of HS are evident. The predicted position of the J = 55,1 ← 54,2 transition of HS according to the spectroscopic constants of Azzam et al. (2013) is also depicted.

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