Left: radiation pressure distribution for all sources, along with the distributions for nuclear and extranuclear regions. Similar to the minimum-energy magnetic field strength distribution, the radiation pressure estimates for the extranuclear regions are, on average, smaller and more narrowly distributed than those for the nuclear regions. Right: radiation pressure distributions for regions within the SFRS and GOALS galaxies. The radiation pressures for regions within the SFRS galaxies are, on average, smaller than those within the GOALS sources. The vertical lines in both figures indicate the minimum and maximum radiation pressure estimates averaged over a sample of HII regions measured on ∼50–100 pc scales by Barnes et al. (2021), indicating that our measurements largely fall between their extreme average values.