Table 1: Adopted gas-phase elemental abundances with respect to hydrogen.
Element Abundance

D $1.5\times 10^{-5}$

He $7.5\times 10^{-2}$

C $7.9\times 10^{-5}$

N $2.6\times 10^{-5}$

O $1.8\times 10^{-4}$

S $1.7\times 10^{-6}$

PAH $1.0\times 10^{-7}$

**Table 1:** Adopted gas-phase elemental abundances with respect to hydrogen.
Element	Abundance
D	$1.5\times 10^{-5}$
He	$7.5\times 10^{-2}$
C	$7.9\times 10^{-5}$
N	$2.6\times 10^{-5}$
O	$1.8\times 10^{-4}$
S	$1.7\times 10^{-6}$
PAH	$1.0\times 10^{-7}$

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