Table 3: Default initial conditions.
Low-metal abundance Other parameters

He 6.00(-2)

N 2.14(-5)

O 1.76(-4)

H₂ 5.00(-1) Temperature = 10 K

C⁺ 7.30(-5) $n_{\rm H}$ = $2\times10$ ⁴ cm^-3

S⁺ 8.00(-8) $\zeta$ = $1.3\times10$ ^-17 s^-1

Si⁺ 8.00(-9) C/O ratio = 0.41

Fe⁺ 3.00(-9) $A_{\rm v}$ = 10 mag

Na⁺ 2.00(-9)

Mg⁺ 7.00(-9) C₃H₃⁺ + e $\xrightarrow{0.5\ k_2}$ C₃H₂ + H

P⁺ 3.00(-9) $\xrightarrow{0.5\ k_2}$ C₃H + ...

Cl⁺ 4.00(-9)

e 7.3107(-5)

**Table 3:** Default initial conditions.
Low-metal abundance	Other parameters
He	6.00(-2)
N	2.14(-5)
O	1.76(-4)
H₂	5.00(-1)	Temperature = 10 K
C⁺	7.30(-5)	$n_{\rm H}$ = $2\times10$ ⁴ cm^-3
S⁺	8.00(-8)	$\zeta$ = $1.3\times10$ ^-17 s^-1
Si⁺	8.00(-9)	C/O ratio = 0.41
Fe⁺	3.00(-9)	$A_{\rm v}$ = 10 mag
Na⁺	2.00(-9)
Mg⁺	7.00(-9)	C₃H₃⁺ + e $\xrightarrow{0.5\ k_2}$ C₃H₂ + H
P⁺	3.00(-9)	$\xrightarrow{0.5\ k_2}$ C₃H + ...
Cl⁺	4.00(-9)
e	7.3107(-5)

Note: a(-b) = $a \times 10^{-b}$ , with respect to H abundance.

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