Table 2
Initial abundances, relative to the total number of hydrogen atoms 
.
| Species | Abundance | Species | Abundance |
|---|---|---|---|
| H2 | 0.495 | Si | 7.940 × 10−8 |
| H | 0.01 | Na | 1.738 × 10−8 |
| He | 0.851 × 10−1 | Mg | 1.000 × 10−11 |
| C | 2.692 × 10−4 | Fe | 4.270 × 10−9 |
| N | 5.350 × 10−6 | P | 2.570 × 10−9 |
| O | 2.880 × 10−4 | Cl | 3.162 × 10−9 |
| S | 1.910 × 10−8 | fdtg | 10−4 |
| χCR | 10−17 s−1 |
Notes. These values are from Bosman et al. (2021), although we ignore the CO depletion that they assumed. The abundances of He, P, and Cl are taken from the default ALCHEMIC chemical network. The heavier elements are mainly important for supplying ions into the chemical system. The dust-to-gas mass ratio (fdtg) and the selected cosmic ray ionisation rate (χCR) is also included.
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