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Table 2

Chemical reaction types included in the two versions of the chemical network.

Reaction type Reduced chemical network Full chemical network

Two-body gas-phase reactions x x
Direct cosmic ray ionisation x x
Cosmic ray-induced photoreaction x x
Grain-cation recombination x x
Freezeout x x
Thermal desorption x x

Photodesorption x
Grain-surface cosmic ray-induced photoreaction x
Grain-surface two-body reaction x

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