Physical properties of different structure types at different evolutionary stages. The first row is the comparison between type1 and type3 structures. The second row is the comparison between early, middle and late sources. The dashed lines in panels c and g mark the positions of α_vir = 2. “p” is the p value of the Kolmogorov–Smirnov (KS) test. “p12,” “pl3,” and “p23” are the p values of KS tests between the structures inside early and middle sources, early and late sources, and middle and late sources, respectively. The median values also show in the legends.