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. Author manuscript; available in PMC: 2018 Jun 7.
Published in final edited form as: Phys Rev E. 2017 Jun 30;95(6-1):062308. doi: 10.1103/PhysRevE.95.062308

FIG. 1. Robust interdependent 2-NoN.

FIG. 1

Intra-module links (black) represent connectivity, while intermodule links (wiggly blue lines) express mutual dependencies. The occupation variable ni specifies whether a node is present (ni = 1) or removed (ni = 0). The activation state σi, defined through inter-module dependencies, indicates whether a node is activated (σi = 1) or inactivated (σi = 0). Nodes can be activated even if they do not belong to the giant connected activated component G. Note also that the configuration of occupation variables n⃗ is identical for the module on the left in a and b. Legend: ◉ σi = 1; ● ni = 1, σi = 0; ○ ni = 0, σi = 0.