Age distribution of very poor (black), poor (blue), moderate (red), and rich (maroon) clusters. Distributions of all the four groups of clusters peak in the range of log(t) = 8.00–8.25. Cumulative age distribution of all the studied clusters (chocolate) shows a peak at ~130 ± 35 Myr. Age distribution of the compiled sample of 468 clusters peaks at ~130 and ~750 Myr.
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