Velocity dispersion vs. halflight radius, for the population of dwarf spheroidals plotted in Figure 5 (excluding those for which the vertical errorbar is >100%). Overplotted is the scaling relation ﹩{ \mathcal V }/(\mathrm{km}\,{{\rm{s}}}^{-1})=\sqrt{{R}_{{\rm{h}}}/\mathrm{pc}}﹩, where ﹩{ \mathcal V }\equiv \sqrt{3}{\sigma }_{{v}_{\mathrm{los}}}﹩ (McGaugh et al. 2007; Walker et al. 2010; Walker & Loeb 2014).