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