Performance metrics as a function of the difference between χ² single and χ² binary values. The plot shows purity (precision, purple line), completeness (recall, green line), and F_β score (orange line) across different threshold values, where β = 0.5. The vertical dashed line is the χ² threshold that maximum the F_β score. Beyond this threshold, completeness decreases most rapidly, followed by F_β score, while purity remains high.