Distributions of mean radio flux densities, S_mean,1400, at 1400 MHz for the populations of isolated Galactic radio pulsars in the PMPS, the SMPS, and the low- and mid-latitude HTRU survey (in yellow, light blue and purple, respectively). We show the individual probability density functions obtained via KDE using a Gaussian kernel to facilitate comparison. Estimates for the observed population are shown as solid lines, while our best-parameter simulation is shown with dashed lines. Data taken from the TPA program (Posselt et al. 2023).