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