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