Angular diameters from the power-law fit compared with other laws. Panel (a) shows diameter from other fitting methods (θ_other) vs. θ_PL; the black dashed diagonal is the one-to-one relation θ_other = θ_PL. Panel (b) shows the fractional difference, (θ_other − θ_PL)/θ_PL, in percent. The colored solid curves in panel (b) are running-median trends for each law, computed from the same point sets shown in panel (a). Power–2 and quadratic diameters remain closest to θ_PL, typically within 0.5%. The quadratic law often gives higher χ² when fewer than two visibility nulls are sampled, reflecting parameter degeneracy. Linear-law and uniform-disk diameters are smaller because they underrepresent or ignore limb-darkening curvature, with the largest uniform-disk offsets in H.