Example of two solutions for a single-chord stellar occultation (by the TNO Ixion on 24 June 2014). A circle with 308.25 km in radius was fit, which is the nominal value from Lellouch et al. (2013), and the given uncertainty is represented by the purple cross (in the upper right corner). The blue segment represents the observed chord. The chord length is defined by ingress and egress, which are the two points where the circles intercept each other. The red lines are the uncertainties of ingress and egress. The error bars at the center of the circles correspond to the uncertainties of the object position (fit center) relative to the Gaia DR2 propagated star position. Each circle represents one of the two possible solutions, with the center to the north or south of the observed chord.