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