Orthogonal (normal) residuals of the chord extremities with respect to the global limb solution, plotted as a function of position angle in the ellipse-aligned frame. Residuals are measured along the local normal to the best-fitting ellipse, ensuring a geometrically consistent assessment of deviations over the entire limb. Each colour and marker corresponds to a different occultation epoch (same coding as in Fig. 2). No clear systematic trend with position angle is observed, indicating that the residuals are consistent with random scatter within the adopted observational and model uncertainties. The offsets observed for the 28 April 2021 and 30 June 2022 epochs are discussed in Sect. 5 and may be associated with changes in the projected figure of the body at different rotational phases or aspect angles.