This work analyzes the residual structure of the radialacceleration relation (RAR) in the SPARC galaxy sample. After removing the leading dependence on halo fraction,a weak but persistent radial structure remains in theresiduals. This structure forms a broad band aroundR/Rd ≈ 2.5–3.5. The study does not propose a new gravitational law.Instead, it highlights that the apparent tightnessof the RAR still contains internal dynamical structure.
umimoto (Sun,) studied this question.