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Table 4

Elemental abundances used in the models with respect to the total hydrogen abundances.

Element E1 E2

He 0.14 0.14
C 7.3e-5 7.3e-5
N 2.1e-5 2.1e-5
O 1.8e-4 1.8e-4
S 8.0e-8 4.5e-7
Si 8.0e-9 1.0e-6
Mg 7.0e-9 2.4e-6

Notes. E1 is taken from the low-metal abundance case adopted in Wakelam & Herbst (2008) and taken from Graedel et al. (1982) and Morton (1974). For selected elements in E1, Si and Mg, we considered 3% of sputtering from the abundances in Anders & Grevesse (1989), and other elements are taken from EA2 and EA3 of Wakelam & Herbst (2008).

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