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Table 3
Synopsis of the derived column densities and 12C/13C isotopic ratios.
| Source | υmin − υmax |  |
 |
12C/13C | |
|---|---|---|---|---|---|
| [km s−1] | [1013 cm−2] | [1013 cm−2] | CH | CN(a) | |
| Sgr B2(M) | 40–90 | 4.61 |
73.02 |
15.8 |
>12 |
| W51E | 45–75 | 1.77 |
66.36 |
37.5 |
35 ± 12 |
| G34.26+0.15 | 35–70 | 0.20 |
9.38 |
47.0 |
28 ± 4 |
| W49(N) | −5–25 | 0.68 |
 |
 |
44 ± 22 |
| W3(OH) | −55–(−38) | <0.11(b) |  |
>58 | 63±16 |
Notes. (a) Values taken from Milam et al. (2005) and references therein. (b)The column density for the non-detection was derived using the 2σ rms of level.
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