Comparison between the mean LSD Stokes V profiles (red) of the predictive distribution and the observed LSD Stokes V profiles (black), for a subset of the rotational phases. The profiles are offset vertically according to the rotational phase, as indicated in blue. The marginal predictive uncertainty is shaded in light grey and depicts three standard deviations. The corresponding posterior predictive uncertainty is shaded in light blue, and the blue bars represent the corresponding observational uncertainties.