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