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Page references (p.55, p.57) and marker columns (!) appear in very few rows (< 12% coverage) but sit at the far left/right margin with a clear gap to the main content. Add a third detection tier that catches these narrow margin columns when they have >= 2 distinct rows and are within 15% of the content edge with >= 40px gap to the nearest main column. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>