Fig. 5

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Hyperfine structure of the 1391.5 GHz transition. The spacing between the different hyperfine levels was increased for visibility, and the overall separation between the J = 5/2 and 3/2 levels is not to scale. The transitions J = 5/2 → 3/2,l =  + 1 →  −1 at 1390.6 GHz, difficult to observe from SOFIA because of residual atmospheric absorption, are not shown.

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