Table 4
Control parameters of the LTE models represented in Fig. 9.
| Histogram |  |
Tkin (K) | [12CO∕13CO] | [13CO∕C18O] |  / |
 / |
|---|---|---|---|---|---|---|
| 1. 13CO(1–0) vs. 12CO(1–0) | [5, 10, 20, 30, 50, 75] | [10–25] | 60 | 30 | 1 | 1 |
| 2. 13CO(1–0) vs. 18CO(1–0) | [5, 10, 20, 30, 50, 75] | [10–25] | 60 | 30 | 1 | 1 |
| 3. [13CO/18CO] vs. [12CO/13CO] | 40 | [10–25] | [120,  ,  ,  ] |
[15,  ,  ,  ] |
1 | 1 |
| Histogram |  |
Tkin (K) | T2−1/T1−0 | T3−2/T2−1 | τ2−1/τ1−0 | τ3−2/τ2−1 |
| 4. 12CO [3–2/2–1] vs. [2–1/1–0] | [ , 40] |
[10–25] | [1.7, 2.2, 2.8] | [1.7, 2.2, 2.8] | 0.2 | 1 |
Notes. 
is the list of optical depths of the lines used to generate the family of curves,
and
are the ranges of kinetic temperatureused for 13CO and 12CO, respectively. [12CO/13CO] and [13CO/C18O] are the adopted isotopic ratios. The ratios of excitation temperatures for different isotopologs or rotational transitions are indicated by the columns Ta /Tb, and the ratios of opacities for distinct rotational transitions are given in the columns τa /τb. The colors used for control parameters in this table correspond to the colors of the curves in Fig. 4.
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