Semimajor axis R_3 σ of the 3 σ isophote, measured in units of the half‐light radius R_e of the best Sersic profile, plotted as a function of the axis ratio q_K. Squares indicate late spirals; the dashed line is the best fit to their R_3 σ/R_e vs. ﹩\mathrm{ln}\,q_{K}﹩ relation. Triangles indicate early spirals; the dotted line is the best fit to their R_3 σ/R_e vs. ﹩\mathrm{ln}\,q_{K}﹩ relation. The labeled outlier, NGC 1068, is excluded from the fit.