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Hi Marta,
For starters, see the link below for the documentation on fuels for a detailed description of each variable (including carbon stored in non-energy usage)
http://tinyurl.com/2eno5zq
For clarification, that variable indicates the fraction of the carbon in the fuel (by weight) that remains permanently stored when the fuel is used for non-energy purposes.
Perhaps another COMMEND member can give you more advice on specific appropriate data.
Cheers,
Tory