Distribution of sizes for regions of high Hα velocity dispersion. The red line shows a result of a power-law fit to the data for R_eff = 70 − 300 pc. This fit agrees with a power-law approximation for the sizes of superbubbles according to hydrodynamical simulations (α = −2.7 obtained by Nath et al. 2020). The distribution of larger and smaller regions is better approximated by log-normal distribution (the blue line). The dashed black line and the grey area show the median spatial resolution and its standard deviation across our sample.