Fig. 3
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PAH coagulation model without the presence of dust grains at r = 10 au and θ = 0 in the coagulation layer for an initial ISM PAH abundance of coronene monomers. The distribution is shown for selected time cuts after the start of the simulation. The growth of PAH monomers to very small carbonaceous grains is very fast, and within years only the largest clusters remain.
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