Comparison between C1R and C2R. Panel a: occultation chords of the 2017 July 23 event detected, for Chariklo’s main body (blue) and for the C2R ring (cyan). The uncertainties at the extremities of the chords are indicated in red. For sake of clarity, the C1R chords are not reproduced here, and can be seen in Figs. 2 and 4. The fitted ellipses to the C2R is drawn in black. The 1σ uncertainty region of that fit is indistinguishable from the black line thickness at this scale. The best-fit ellipse to the C1R ring detections is shown in green. Panel b: fitted centres of C1R (green) and C2R (black) in the sky plane. The darker colours stand for the simultaneous 1σ uncertainty regions (corresponding to the criterion), while the lighter colours stand for the 3σ regions ( criterion). The red dashed line shows a 2.28 km offset between the C1R and C2R centres. Panel c: radial difference Δr (in the ring plane) between C2R and C1R vs. the longitude, deduced from the elliptical fits of panel a. The grey zone delimits the 1σ region associated with the uncertainties on C1R and C2R. It shows that no significant radial distance variations between C1R and C2R are detected at that level.