Fig. 3

Kolmogorov–Smirnov statistic value of the distributions compared. This figure shows 4 line charts that show the KS statistical test’s value at 30 edge cut-off thresholds \(\zeta\) when comparing the production networks’ observed degree distribution to what we would expect from a random and scale-free network with the same parameters, according to year and degree type. The closer the KS statistic value is to 0, the more likely the two samples are drawn from the same distribution. The node and edge numbers are also included according to 4 cut-off points \(\zeta\)