Probability density functions of Hα fluxes from NGC0628, NGC3627, and M 33, the three galaxies for which both HII region and GMC catalogs are available. Results of the powerlaw.py (red line) and Maschberger & Kroupa (2009) (blue line) fits along with observational data for NGC0628, NGC3627, and M33 from Santoro et al. (2022) and Lin et al. (2017) are shown. NGC0628 and NGC3627 are the two PHANGS galaxies for which both the HII region and GMC samples are available. The Hα data for M33 are from Lin et al. (2017). The adopted completeness limit for the fits (equivalent of L_min in Santoro et al. 2022) are shown as a dashed green line and given in Table 1 The error bars are proportional to $1/\sqrt{(N)}$, where N is the number of points in the bin. When no error bar is plotted, it means N = 1.