Fig. 2
Temperature (top left panel), electronic fraction (i.e. n(e)∕nH,
top right panel), molecular fraction (i.e. 2n(H2)∕nH,
bottom left panel), and depletion (bottom right panel) in the pre-shock medium as functions of
G0 and 
(or 
) for a density nH = 104
cm−3. The depletion is computed as the fraction of the abundance of heavy elements locked up onto grain mantles.
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