Age distribution averaged over the indicated intervals of mass for the Antennae clusters (data points) and for Model 1 (lines). In this model, clusters have a power-law initial mass function, a constant formation rate, and sudden mass-dependent disruption. The dashed and solid lines were computed for less massive and more massive clusters, respectively, from Equations (7) and (B3)–(B5) with τ _* = 5 × 10 ⁷ yr and k = 0.62.