Geometry of a transiting ring system with parameters described in Table 2. Top: ring system in grey scale, with the stellar transit path in green, with a red stellar disc. The vertical green dotted lines indicate when the stellar disc is moving behind a ring edge. Bottom: theoretical light curve for the ring system. Note: the projected gradient of the light curve is related to the geometrical tangent of the ring edge with the star and that the light curve drops or rises before the ring crossing because of the finite size of the star.