Bayesian student-t fit for early-type stars and a two-component model fit for late-type stars. The latter includes sub-models for stars brighter and fainter than 14 mag, using a two-component normal model with a quadratic mean equation and a student-t model with a linear mean equation, respectively. The left side of the figure displays median errors for all stars in constant bins (0.65 mag), with lines representing the mean and 1-σ range of the models.