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