Instantaneous best-fitting limb to the occultation chords. The blue lines are the occultation chords derived from Table 4, while the red segments are the uncertainties at the chord extremities. The black ellipse is the best-fitting solution, whose parameters are given in Table 5. The grey area shows all the solutions that are found to within a 1σ level from the best-fitting ellipse, i.e. corresponding to . The dashed purple lines show the projections onto the sky from the two NDR stations (cf. Table 3), and the brown dotted lines show the projections from the near-miss stations (cf. Fig. 3a).