Probability distribution of the number of carbon atoms in the rings of the PAH molecules formed from C₆H (left panels) or C₆H₂ (right panels) at (a), (b) 10; (c), (d) 300; (e), (f) 800 K. The probability is calculated as the ratio between the numbers of rings of a given size over the total number of rings of all formed molecules in a simulation cell.