Figure 4

Network structure of the Italian PON R&C funding program. Each vertex is a university, research institution or enterprise funded by the program; two vertices are connected if they are part of a TSA for at least one project. Only the principal giant component is depicted (other connected components have less than six vertices each). The set of nodes constituting the centre of the (giant component of the) PON R&C network is highlighted in red, while the main hub is depicted in orange. The centre include public and private research institutions, all the major Universities involved in the program, and also some large private enterprises.