The blue lines are the occultation chords of the main body projected onto the sky plane, as seen from nine observing sites (Table 1). The red segments are the uncertainties (1σ level) on the extremites of each chord, as derived from the timing uncertainties in Table 1. We show the chord from Crni Vrh in dashed line because it is considerably uncertain. For the observatories for which two telescopes were used we show only the best chord. Celestial north (‘N’) and east (‘E’) are indicated in the upper right corner, together with the scale. The blue arrow shows the motion of the star relative to the body. Haumea’s limb (assumed to be elliptical) has been fitted to the chords, accounting for the uncertainties on the extremity of each chord (red segments). The limb has semi-major axis a′ = 852 ± 2 km and semi-minor axis b′ = 569 ± 13 km, the latter having a position angle P_limb = −76.3° ± 1.2° counted positively from the celestial north to the celestial east. Haumea’s equator has been drawn assuming that it is coplanar with the ring, with planetocentric elevation B_ring = 13.7° ± 0.5°; see Fig. 3. The pink ellipse indicates the 1σ-level uncertainty domain for the ring centre, and the blue ellipse inside it is the corresponding domain for Haumea’s centre. To within error bars, the ring and Haumea’s centres (separated by 33 km in the sky plane) cannot be distinguished, indicating that our data are consistent with a circular ring concentric with the dwarf planet. The points labelled ‘a’, ‘b’ and ‘c’ indicate the intersections of the a, b and c semi-axes of the modelled ellipsoid with Haumea’s surface.