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