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Published online by Cambridge University Press: 03 August 2017
If the cluster formation rate is constant and the disruption time of clusters depends only on their initial mass as t dis = t 4 × (M cl/104M ⊙)γ, the values of t 4 and γ can be derived in a very simple way from the age and mass histograms of observed clusters. We derived these values from cluster samples in fields of five galaxies: M51, M33, LMC, SMC and the solar neighbourhood. The values of γ are the same in the five galaxies with < γ > = 0.62 ± 0.03. However the disruption time t 4 of clusters of 104M ⊙ is very different in the different locations.