Table 4
Statistics of the molecular abundances.
| SO | H13CN | H13CO+ | HN13C | C2H | |
|---|---|---|---|---|---|
| [10−10] | [10−10] | [10−10] | [10−11] | [10−9] | |
| IR dark clumps | |||||
| Mean | 1.7 ± 0.5 | 2.7 ± 2.2 | 7.4 ± 2.0 | 2.6 ± 0.6 | 2.7 ± 0.4 |
| Median | 1.5 | 0.7 | 8.3 | 2.6 | 2.7 |
| IR bright clumps | |||||
| Mean | 1.6 ± 0.4 | 4.0 ± 1.8 | 5.5 ± 0.9 | 2.2 ± 0.3 | 2.2 ± 0.3 |
| Median | 1.1 | 1.0 | 5.7 | 2.3 | 2.4 |
| H II region(a) | |||||
| 0.9 ± 0.2 | 4.1 ± 2.4 | 6.8 ± 0.8 | 2.0 ± 0.2 | 1.4 ± 0.2 | |
| Full sample | |||||
| Mean | 1.6 ± 0.3 | 3.5 ± 1.3 | 6.2 ± 1.0 | 2.4 ± 0.3 | 2.3 ± 0.3 |
| Median | 1.2 | 1.0 | 6.1 | 2.5 | 2.5 |
Notes. SiO was detected in only one source (SMM 3), so it is excluded from this table. A K-M survival analysis was used to calculate the mean and median abundances whenever the data set contained left-censored values or upper limits. The uncertainty quoted in the mean values is the standard error of the mean (i.e. standard deviation divided by the square root of the sample size). (a) The present sample contains only one H II region (IRAS 13039-6108), so the reported values refer to the abundances in that source.
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