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Table 2

Significance of the diffusion pre-factor for different grain species.

Species Gas-phase Grain surface
JH 100% 100%
JN2 100% 100%
JCH4 100% 99%
JHNCO 100% 99%
JO2 99% 98%
JCH3 100% 96%
JHCO 99% 94%
JCH3OH 100% 93%
JH2CO 98% 89%
JCO 99% 86%
JNO 98% 83%

Notes. The effect of different grain surface species on the model is caused by changes in their diffusion pre-factor. The values are the percentages for the gas-phase and grain surface species that are within twice the abundance ratio difference of models M2 and M3. The lower the value, the greater the impact of the species on the model results.

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