Figure 1. Commented papers accumulate on average more citations.

(a) Average number of citations received by papers published in Physical Review Letters as a function of the year of publication. The average number of citations accumulated by non commented papers is represented by the black line, while the average number of citations received by commented papers is represented by the gray bars. (b), (c) and (d). Same as in panel a but for articles published in Science, Water Resources Research and Geology, respectively.