Illustration of the main StarHorse reliability flag, SH_OUTFLAG[0], corresponding to a cut in the σ_d/d₅₀ vs. log g₅₀ diagram (top left panel). In each panel, the coloured distribution corresponds to converged stars with SH_OUTFLAG[0]==“0”, while the grey distribution corresponds to all stars. Top right panel: distance histograms for the two samples, and middle panels: density in Galactic XY co-ordinates, highlighting the “bloody-eye” effect of stars with poorly-constrained posterior distances that disappear when applying the reliability flag. Bottom panels: CMDs of both samples, highlighting the disappearance of the nose feature when applying the reliability flag.