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Table 3
Types of models used to interpret the observations.
| Model | Data modeled | Constraint |
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| 1. flat disk with a power-law intensity | composite 12CO line-profile, photocenter and PSF-FWHM | • emitting region |
| • limits on the gap width | ||
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| 2. 1D LTE slab with single NH and single Tgas | 12CO, 13CO, and C18O rotational diagrams 12CO and υ = 2 → 112CO rotational diagrams | • average NH and Tgas for each isotopolog |
| • CO excitation mechanism | ||
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| 3. flat disk with a power-law column density, temperature distribution, and LTE excitation | 12CO, 13CO, C18O rotational diagrams and 12CO P(9), 13CO R(4), and C18O R(6) line-profiles | • column density distribution |
| • temperature distribution | ||
| • depth of the gas density drop | ||
| • limits on the gas gap width and depth | ||
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