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Fig. 17

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COM column densities (top left panel) and abundances relative to H2 (top right panel), methanol (bottom left panel), and dimethyl ether (bottom right panel). Only the main isotopologues are represented. The cold and warm components of the envelope are described by the blue and red histograms. The two shocks are represented in yellow and green. The upper limits are indicated by the black arrows.

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