Fig. 4
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Representative 12CO (6−5) (black) and 13CO (6−5) (blue) spectra of the four evolutionary groups. The 13CO (6−5) spectra are scaled up by a factor of two for an easier comparison, and the fitted Gaussian functions are overlaid as red curves. In the bottom panels, the residuals from Gaussian fitting are shown with ±3σ noise levels (dashed lines).
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