Table 5
Assumptions on column density ratios or relative abundances for the basic and improved sandwich models.
| Column density ratio | Basic model | Improved model | ||
|---|---|---|---|---|
| Inner & outer layers | Inner layer | Outer layer | ||
| Assumed | 12CO/13CO | 101.8 ~ 63 | 101.8 | [101.3, 101.9] ~ [20, 80] |
| 13CO/C18O | 100.9 ~ 7.9 | 100.9 | [100.75, 101.4] ~ [5.6, 25.1] | |
| 13CO/HCO+ | 102.88 ~ 759 | [102.88, 103.78] | [102.88, 103.78] | |
| 13CO/H13CO+ | 104.68 | 12CO/HCO+ | 12CO/HCO+ | |
| Derived | 12CO/C18O | 102.7 ~ 500 | 102.7 | [102.05, 103.3] |
| C18O/H13CO+ | 103.78 | [103.78, 104.68] | [102.78, 104.93] | |
| 12CO/HCO+ | 104.68 | [104.68, 105.58] | [104.18, 105.68] | |
Notes. We write X/Y the column density ratio N(X)/N(Y), for each couple of species {X, Y}. For the improved model, intervals correspond of the explored ranges when estimating the corresponding ratios. Moreover, N(13CO)/N(H13CO+) is deduced from N(13CO)/N(H13CO+) = N(12CO)/N(HCO+) (see Sect. 4.5.2).
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