Table 6
Observed median abundances and standard deviation in a(x) = a × 10x for the UCHiis for T = 100 K and T = 36.0 K. x(e) is the ionization fraction.
| Molecule | Abundance | Standard deviation | Abundance | Standard deviation | det | lim | none |
| T = 100 K | T = 36.0 Ka | ||||||
|
|
|||||||
| HCN | 4.6(–08) | 1.4(–08) | 5.6(–09) | 1.6(–09) | 5 | 0 | 4 |
| HNCO | 1.1(–09) | 1.3(–09) | 8.6(–11) | 9.9(–11) | 6 | 3 | 0 |
| HN13C | 7.6(–10) | 1.0(–09) | 9.2(–11) | 1.3(–10) | 9 | 0 | 0 |
| C2H | 3.9(–07) | 2.3(–07) | 4.6(–08) | 2.7(–08) | 8 | 1 | 0 |
| SiO | 3.7(–10) | 1.2(–09) | 4.6(–11) | 1.6(–10) | 5 | 4 | 0 |
| H13CO+ | 1.0(–09) | 4.5(–10) | 1.3(–10) | 5.4(–11) | 9 | 0 | 0 |
| N2H+ | 4.1(–09) | 4.1(–09) | 7.4(–10) | 9.2(–10) | 9 | 0 | 0 |
| 13CS | 6.3(–09) | 5.3(–09) | 7.9(–10) | 6.7(–10) | 9 | 0 | 0 |
| SO | 5.5(–09) | 2.2(–09) | 1.0(–09) | 4.0(–10) | 5 | 1 | 3 |
| C18O | 1.3(–06) | 9.9(–07) | 2.0(–07) | 1.5(–07) | 8 | 1 | 0 |
| H2CO | 4.9(–09) | 3.7(–09) | 7.2(–10) | 8.8(–10) | 16 | 2 | 0 |
| C33S | 1.2(–09) | 6.3(–10) | 2.5(–10) | 1.3(–10) | 7 | 2 | 0 |
| OCS | ≤1.6(–09) | 3.5(–09) | ≤1.3(–09) | 3.2(–09) | 6 | 12 | 0 |
| CH3OH | 8.7(–09) | 2.4(–08) | 9.7(–10) | 2.5(–09) | 10 | 8 | 0 |
| CH3OCHO | ≤1.3(–09) | 3.0(–09) | ≤9.7(–11) | 2.3(–10) | 0 | 9 | 0 |
| CH3CN | 1.3(–09) | 1.2(–09) | 1.6(–10) | 1.6(–10) | 7 | 2 | 0 |
| x(e) | 9.4(–08) | 4.3(–08) | 1.2(–08) | 5.6(–09) | 9 | 0 | 0 |
Notes. The last three columns show the number of sources with a detection (det), non-detection (lim), and detection but no derived column density (none) due to reasons described in Sect. 3.2.
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