Figure 7

Interest flow across decades: (A) all decades; (B) authors who started publishing in the 80’s; (C) authors who started publishing in the 90’s; (D) authors who started publishing in the 00’s. Authors who start studying y PACS end up sharing their interest across x PACS. Each row is normalized over the number of authors who started using that PACS so that the diagonal represents the fraction of authors that kept some interest (see equation (2)) in that PACS at the end of their career