The RV semi-amplitude K induced by planets TOI-4633 b and TOI-4633c under the perturbation of a stellar companion. Selected as the most extreme case of orbital structures, in panel (a), the maximum deviation between the Keplerian model and the N-body model ΔK_b = 90 m s⁻¹ when i_b = 0°, in panel (b), the maximum deviation between the Keplerian model and the N-body model ΔK_c = 0.75 m s⁻¹ when i_b = 0°.