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Fig. 5.

image

Ratio of the average J-type enhanced CH3OH abundance to the average C-type enhanced CH3OH abundance. As is clear, there is no chemical difference between J-type and C-type enhanced CH3OH, except at low vs and low nH. This major difference – a factor of 8000 – arises as a result of the C-type shock failing to sputter grain surface material whilst the J-type shock instantaneously evaporates grain surface CH3OH.

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