Fig. 1.

Temporal evolution of the fractional abundances of selected carbon-chain species in the two-phase model simulated with the RE approach and the macroscopic MC method. RE represents the rate equation calculation and MC represents the macroscopic Monte Carlo simulation. The two-phase model adopts different tcold, tcold = 105 yr in the two-phase model A while tcold = 3 × 105 yr in the two-phase model B. The temporal evolution of the temperature T is also plotted in the figure.
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