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Fig. 1


The J = 54,1 ← 53,2 transition at 399.6 GHz (left side: P = 28 mTorr/3.7 Pa, mod. depth = 600 kHz) and the J = 42,3 ← 41,4 transition at 1023.4 GHz (right side: P = 57 mTorr/7.6 Pa, mod. depth = 1800 kHz) recorded in natural abundance.

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