Fig. 11
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Overlaid spectra for HCN (0, 1le, 0) (in black) and (0, 1lf, 0) (in green) transitions in different rotational transitions towards RAFGL 4211 (left), R Vol (middle), and W Ori (right). These sources show brighter J = 4−3 (0, 1le, 0) emission than J = 4−3 (0, 1lf, 0). The vertical lines are labelled in the same way as for Fig. 1.
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