Normalized threshold current, as a function of coupling strength for two tree network ensembles. (a) Curves for all 25 full binary trees of Fig. 4 (of our paper). (b) The same for 50 general binary trees with all possible numbers of nodes and leaf nodes with a maximal number of generations . The curves are color coded according to the tree's normalized threshold currents in the strong-coupling limit . The dashed horizontal lines show the value of the applied constant current used for stochastic simulations in Fig. 9 (of the original paper).