Relative sulfur abundance as function of AV for a spherical cloud. The model parameters are mass: M = 1 M⊙, surface density n = 106 cm-3, and FUV intensity χ = 106 in units of Draine. Three different chemical networks were applied: a) the original UDFA rates; b) the original UDFA rates with all reactions possessing γ < 0 set to zero; and c) all reactions with γ < 0 replaced by the new fits from Table 1.
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