Co-authors are ranked by their own lifetime peer-reviewed citation count, not by the number of joint papers with John Keller. A frequent collaborator with modest citation impact may rank below a highly cited collaborator with fewer shared publications.
What do A pos and C pos mean?
The # column is the rank of each listed entry for John Keller — rank 1 means this entry is where John Keller has the most articles or citations. A pos and C pos show the reciprocal: the position of John Keller within that entry's own ranked list, by articles and citations respectively. A low value means John Keller is among the most prominent contributors for that entry.
