Mass and radius posteriors, using our best fit to the data of our model with three uniform-temperature circular spots plus a modulated power law—i.e., our Model 5. The dotted lines show the priors. The approximate upper diagonal boundary in the mass–radius plot corresponds to our c²R_e/(GM) = 8 prior upper limit, whereas the approximate lower boundary is set by the likelihood rather than by our prior c²R_e/(GM) = 3.2 lower limit. The mass posterior is single-peaked and is shifted only slightly from the tight prior given by radio observations, whereas the radius posterior is bimodal (with a larger mode at higher radii).