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Fig. 3.

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Calculated fractional abundances of CH3CHO and CH3CHS, together with the abundance of C2H5, shown as a function of time. The horizontal dotted lines correspond to the values observed in TMC-1 adopting the column densities in Table 2 and a column density of H2 of 1022 cm−2 (Cernicharo & Guélin 1987).

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