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Table 3

Description of models.

Bins Sizes (μm) Td HUV LUV H2 formation
HUV-LH-Tg 1 0.1 Tg LH
HUV-LH-Ta 1 0.1 Ta LH
HUV-B14-Ta 1 0.1 Ta B14
LUV-LH-Tg 1 0.1 Tg LH
LUV-LH-Ta 1 0.1 Ta LH
LUV-B14-Ta 1 0.1 Ta B14
M-HUV-LH 16 [5.10−3–103] Ti {i = 1...16} LH
M-HUV-B14 16 [5.10−3–103] Ti {i = 1...16} B14
M-LUV-LH 16 [5.10−3–103] Ti {i = 1...16} LH
M-LUV-B14 16 [5.10−3–103] Ti {i = 1...16} B14
Set-HUV-LH-Ta 1 See Appendix C Ta LH
Set-HUV-B14-Ta 1 See Appendix C Ta B14

Notes. HUV stands for high uv field and LUV for low uv field. LH is for the classical treatment of the Langmuir-Hinshelwood mechanism and B14 when the prescription of Bron et al. (2014) is used instead. Tg means that the dust temperature equals to that of the gas, Ta is the weighted-area dust temperature as defined by Eq. (1). The parameter Ti is the temperatureof ith grain population, M stands for multi-grain models, and Set for dust models mimicking grain growth and dust settling similar to multi-grain models. As an example, the model M-HUV-B14 is a multi-grain model computed using the B14 method with a high uv field.

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