Fig. 6.

The Unique Robustness Measure (R) as an index of network vulnerability to epidemic spread. The efficiency of (R) in ranking networks according to their vulnerability towards an unknown epidemic threat was evaluated by comparing the rank of the face-to-face contact networks (Isella et al., 2011) according to their R with their respective rank measured as the fraction of nodes reached by the infection in 100 different SIR scenarios (see Methods). The color scale maps the density of observations falling within each hexagon.