Illustration of the consequence of using R_e as galaxy size for UDGs and dwarf galaxies. Here we show two galaxies of similar stellar mass at the same physical scale: UDG-B5 (top) and a representative dwarf galaxy (SDSS J224114.12−003715.0, bottom). The colour image is the gri-band composite with a grey-scaled background for contrast and contours showing R_e (dotted), R₁, (solid) and R_0.5 (dot-dashed). The surface brightness and stellar mass density profiles derived for both galaxies are also shown.