How are co-authors sorted?
Co-authors are ranked by their own lifetime peer-reviewed citation count, not by the number of joint papers with Johannes Siegrist. 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 Johannes Siegrist — rank 1 means this entry is where Johannes Siegrist has the most articles or citations. A pos and C pos show the reciprocal: the position of Johannes Siegrist within that entry's own ranked list, by articles and citations respectively. A low value means Johannes Siegrist is among the most prominent contributors for that entry.