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Fig. 5
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Observations of the 2k → 1k methanol triplet toward 869 (left), 1390 (middle), and 4149 (right). The rest frequency for these plots is defined as the strongest transition, the A+ line at 96.741 GHz. The E transition on the left side is 20–10 at 96.744 GHz, and the E transition on the right side is 2−1–1−1 at 96.739 GHz
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