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Table 1

Assumed composition of the carbonaceous material in cold disc regions.

Fraction f Outgassing Released
Carbonaceous dust component Structure of C Process Temperature Species Percent

Pure carbon dust Amorphous carbon 0.1 Oxidation 1 100 HCCO 100
Volatile organic material Aliphatic compounds 0.1 Pyrolysis 325 CH4 50
C4H10 50
Moderately volatile organics Aromatic compounds 0.1 Evaporation 425 C16H10 100
Refractory organic material CHON 0.6 Pyrolysis 425 CH4 15
CO 25
CO2 20
C16H10 40
Others 0.1

Notes. The fractions of carbon bound in the different components are given with respect to the total carbon bound in the carbonaceous material, which in turn is a fraction of 0.55 of the C element abundance. For the different components, we list the gases assumed to be released by heating or oxidation and the corresponding approximate release temperatures (in K) and the relative proportions of the products.

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