Parameter changes of the former collaborators' networks after superstars' deaths.

Average values of network parameters (i.e. number of nodes N, number of edges M, clustering coefficient c and network efficiency e) and the changes of these parameters in the collaboration networks of superstars' former collaborators. Assuming a superstar died in year y, T−1 and T−2 networks are his egocentric networks containing only the first tier neighbors and both the first and second tier neighbors from year y−4 to y. and networks are the former collaborators' collaboration networks of themselves and with their first tier collaborators from year y+1 to y+5. After the superstars' death, the former collaborators tend to disconnect with each other and find other collaborations elsewhere.