This grid of models is particular designed for Orion Bar PDR conditions. The chemistry contains 205 species (including 13C) linked by 3231 reactions from UMIST 2006. CH+ and SH+ formation is enhnced …
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n0 (cm-3)
Surface gas density. Applied to density power law.
sint (Draine)
Strength of isotropic radiation field in Draine units.'