Top-cited scientists within the economists and natural sciences journal sets. Top-20 researchers, ranked by , who had their first publication in the time-period cohort 1970-1980. A trajectory terminates in the last observed year in which there was a publication within the journal set, and so a single dot represents a researcher profile with only a single publication. The citation census year Y was 2012 (economics) and 2009 (Nat./PNAS/Sci.). Hence using a 7 year window to allow the citations to properly accrue, only publications published prior to 2005 for economics and 2002 for Nat./PNAS/Sci. are shown.