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variation_plot: xlim([min(xd)-0.5, max(xd)+0.5]) on all learning-curve plots, so the first point lifts off the y-axis (phase windows d6_*) and the last point clears the right edge (d0_5 etc.). Regenerated all figures. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>