Top: results of the posterior validation for Y_5R500. The histogram of the posterior probability, ζ, bounded by the true Y_5R500 parameter, is almost uniformly distributed, except for a small excess in the tails of the posteriors, at ζ> 0.95. The histogram has been normalised by the expected counts in each ζ bin. Bottom: comparison of recovered peak Y_5R500 to the injected Y_5R500. The estimates are unbiased, though asymmetrically scattered, with a scatter that decreases as S/N increases.