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Fig. A.1

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The upper panel shows the comparison between AB Aur and an analytical model rotational diagram for the 12CO v = 1 − 0 transitions observed by Brittain et al. (2003). The solid blue line shows the fit by an analytical model that takes optical depths into account. The results from the same model but without the effect of optical depth are shown in dashed blue line. The lower panel shows the derived line optical depth.

This figure is made of several images, please see below:

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