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Fig. 3

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Mean spectra of the three layers of the Orion B cloud, namely the low-velocity layer (left), the intermediate-velocity layer (middle), and the main-velocity layer (right), from the 13CO (1–0) (top) and C18O (1–0) (bottom) emission rebuilt by ROHSA. The color dotted lines show the systemic LSR velocity of the three cloud layers.

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