Limb-fit diagrams for the eight stellar occultations by (28978) Ixion: (a) 17 August 2020, (b) 13 October 2020, (c) 28 April 2021, (d) 20 May 2021, (e) 17 August 2021, (f) 2 June 2022, (g) 30 June 2022, and (h) 28 July 2023. Each chord is shown in a different colour, corresponding to the observing sites listed in the legends. Positive detections define the limb of the body, while continuous full-length chords represent negative observations that constrain the maximum extent of the limb. The x- and y-axes correspond to the sky-plane coordinates f and g (in km), oriented along the fundamental plane of the occultation. For the single-chord events (e and f), the limb shape was fixed to the global solution; only the astrometric offsets (f, g) were determined. The red segments at the ends of the chords represent the ingress and egress timing uncertainties. An elliptical fit was applied in each case, with the best-fit solution (1σ) shown. The grey-shaded regions around the ellipses indicate the 1σ confidence domains obtained from the fitting procedure. The corresponding parameters are listed in Table 4. The black arrow indicates the direction of the shadow motion, while the arrows labelled N and S denote celestial north and south, respectively.