Top row: differences plot log (age/yr) vs. log (M/M_⊙), for 670 P12 and H03 cross-matched clusters, in the sense P12 minus H03. A two-dimensional Gaussian kernel density estimate is shown as iso-density black curves. The dashed line is the result of the best-fit linear regression; the R² coefficient is shown in the bottom left box. The leftmost diagram shows all 670 clusters processed together; the remaining diagrams are divided by mass ranges. Bottom: idem, for ASteCA vs. DBs (where DBs represent the combined H03 and P12 sample) for the 127 cross-matched clusters.