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Fig. B.1


Results from a two-layer, multi-component fit to the observed CO(2–1) isotopes at the northern Musca position. Upper two panels and the lower left panel: fit with two velocity components derived from the optically thin C18O(2–1) emission line, lower right panel: best model fit for the observed 12CO(2–1) line. In each panel, upper left sub-panel: observed data as a red line and the model fit as a green dashed line. Upper rightsub-panel: individual components, lower left sub-panel: residuals and lower right sub-panel: information on the number and contribution of the foreground. It becomes obvious that two components can be fitted for C18O(2–1) and 13CO(2–1), but are insufficient for the 12CO(2–1) line.

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