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Fig. 3


Boltzmann plots for detected 12CO and, if detected, 13CO emission (black plot symbols). The best fit for the 12CO rotational temperature Trot is shown by the red lines (upper line: P branch, lower: R branch), whereas the best fit Trot for 13CO is shown by the green lines. Model predictions for the best fit (T, N) are shown with the smaller open red/green diamonds. The gray area around the best fit lines show the model predictions for parameters within the 1σ areas shown in Figs. A.1 and A.2. The Boltzmann plots for HD 101412 and HD 104237 are absent for reasons described in Sect. 5.1

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