Histograms of three variability features, Stetson J, ψ^CS, and period S/N (from top to bottom). Each panel shows three histograms, each of which is a histogram of 1) non-variables (dotted line) in the training set; 2) the visually removed LPVs (dashed line); and 3) LPVs (solid line) in the training set. See text for details.