Posterior distributions for an oblate fit to an oblate star assuming 15° standard deviation in the measured PA. In the two-dimensional posterior distributions the 68% (in black) and the 95% (in gray) highest posterior density credible regions are shown. In the one-dimensional posterior distributions the dashed red contour shows a 68% and the dashed orange contour a 95% highest posterior density credible interval. The blue lines show the input values.