Results of the cluster age analysis.

Column 3 lists the number of members of each cluster, while column 4 provides the best-fit β values derived in this work based on spectroscopic effective temperatures. Columns 5 and 6 present the mean age and its standard deviation, both expressed on a logarithmic scale, while column 7 reports the contribution of age spread due to the combination of the statistical measurement errors, obtained from Monte Carlo simulations, and the systematic error 0.1 due to unresolved binaries. Columns 8 to 10 report the ages corresponding to the 50th (median), 16th and 84th percentiles, respectively. Column 1 provides the short labels (A, B, C, ...) used in the figures.