What do A pos and C pos mean?
The # column is the rank of each listed entry for Anthony A Hyman — rank 1 means this entry is where Anthony A Hyman has the most articles or citations. A pos and C pos show the reciprocal: the position of Anthony A Hyman within that entry's own ranked list, by articles and citations respectively. A low value means Anthony A Hyman is among the most prominent contributors for that entry.