Posterior distributions of transverse sizes: semi-major axis, a, and semi-minor axis, b, of the approximating ellipses, relative to the radius, r. The first row represents values for A, and the second row values for B. For better visibility the left-hand histograms are limited to values of a/r < 0.25, which excludes from the plot about 0.1% of all samples for A and 0.004% for B. The colours represent modes according the convention of Fig. 5.