Left panel: mean (μ_i) and standard deviation (σ_i) of the difference between the UGC redshifts, from the t-SVM model, and associated SDSS redshifts for sources contained in the UGC base test set and averaged over redshift bins of size 0.02. Completeness (middle panel) and purity (right panel) as a function of redshift, evaluated on the UGC test set (black) and clean set (cyan). The bin size is equal to 0.1.