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Fig. 7
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Excitation temperature of CH3CCH for transitions jk → j′k′, with j = 6, j′ = 5, and k = k′ = 0 or 2 (para-CH3CCH) and k = k′ = 0 or 3 (ortho-CH3CCH) as a function of the H2 density for three kinetic temperature (20, 50 and 100 K) and a column density of 1014 cm−2.
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