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Plus, minus, multiply, divide, equal and not-equal were approximations (bars spanning the wrong width, the X's arms too long, the not-equal slash at the wrong angle and length, dots sized off the shorter side). They now follow ECMA-376's guide formulas: bars span 73.49% of the width; adjusts pin as the standard pins them; the X's arms follow the box's diagonals cut at 51.965%; the slash leans at adj2 through the full height. Each was checked against PowerPoint's outline at three aspect ratios and custom adjust values (max deviation 0.002 pt). Text rectangles follow the standard too. Wild synthetic set: equation galleries 10.20 -> 5.32, 10.06 -> 5.31, 5.45 -> 2.47; whole set 4.84 -> 4.71. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>