Fig. 9
Gas internal motions. Top: C18O(2–1) FWHM linewidth as a function of H2 column density derived from Gaussian fits to the spectra (red circles). The dashed line represents an analytic approximation used to model the trend. Bottom: linewidth ratios of the two main CO isotopologs over C18 O. The dashed lines represent the constant ratios used in the model (4 for 12CO and 1.75 for 13CO).
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