Comparison of radius distributions across samples. Normalised histogram of nebular (r_circ) radii (log scale) for the PHANGS-HST-Hα catalogue (𝒞_simp regions only are shown in filled blue, whilst the histogram for all regions is shown in grey), compared with Galactic H II region data from Anderson et al. (2014) and observations of NGC 300 from McLeod et al. (2021). Vertical dashed lines indicate the approximate resolution limits of the HST (blue) and NGC 300 (green) datasets.