Table 4
Observed median abundances and standard deviation in a(x) = a × 10x for the HMPOs for T = 50 K and T = 29.5 K. x(e) is the ionization fraction.
| Molecule | Abundance | Standard deviation | Abundance | Standard deviation | det | lim | none |
| T = 50 K | T = 29.5 Ka | ||||||
|
|
|||||||
| HCN | 1.1(–08) | 7.1(–09) | 3.8(–09) | 2.4(–09) | 14 | 0 | 6 |
| HNCO | 1.8(–10) | 3.4(–10) | 7.7(–11) | 1.5(–10) | 17 | 3 | 0 |
| HN13C | 3.7(–10) | 1.9(–10) | 1.3(–10) | 6.6(–11) | 18 | 2 | 0 |
| C2H | 1.4(–07) | 3.8(–08) | 5.0(–08) | 1.4(–08) | 20 | 0 | 0 |
| SiO | 4.0(–10) | 4.0(–10) | 1.4(–10) | 1.4(–10) | 16 | 4 | 0 |
| H13CO+ | 4.5(–10) | 1.4(–10) | 1.5(–10) | 4.8(–11) | 20 | 0 | 0 |
| N2H+ | 2.4(–09) | 1.4(–09) | 1.1(–09) | 5.7(–10) | 20 | 0 | 0 |
| 13CS | 9.0(–10) | 7.5(–10) | 3.2(–10) | 2.6(–10) | 17 | 3 | 0 |
| SO | 1.3(–09) | 9.4(–10) | 6.4(–10) | 4.6(–10) | 20 | 0 | 0 |
| C18O | 2.7(–07) | 1.2(–07) | 1.1(–07) | 4.9(–08) | 20 | 0 | 0 |
| H2CO | 7.1(–10) | 5.6(–10) | 4.7(–10) | 6.0(–10) | 38 | 1 | 1 |
| C33S | ≤1.3(–10) | 1.2(–10) | ≤6.8(–11) | 6.5(–11) | 8 | 12 | 0 |
| OCS | ≤1.3(–09) | 1.6(–09) | ≤2.0(–09) | 2.7(–09) | 17 | 23 | 0 |
| CH3OH | 9.1(–10) | 1.6(–09) | 1.0(–09) | 1.5(–09) | 32 | 8 | 0 |
| CH3OCHO | ≤2.5(–10) | 2.7(–10) | ≤2.1(–10) | 2.3(–10) | 0 | 20 | 0 |
| CH3CN | 1.3(–10) | 1.6(–10) | 1.0(–10) | 1.2(–10) | 13 | 7 | 0 |
| x(e) | 4.3(–08) | 1.3(–08) | 1.5(–08) | 4.6(–09) | 20 | 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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