Radio flux densities of massive stars in a model cluster, using MIST isochrones. Top: present-day mas function. Middle: histograms of predicted radio flux densities. Bottom: cumulative histograms of predicted radio flux densities. The black histogram corresponds to the observed data for the Arches cluster (Gallego-Calvente et al. 2021, dotted) and the grey histogram to the observed data for the Quintuplet cluster (this work, solid).