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Left column: lines of curvature make a quadrangulation of the domain. For
Schwarz P surface, the lines are orthogonal to OA and OC, and meet the AB arc at π/4. For Saddle tower, the lines are orthogonal to O E and E F, and meet OF at π/4. Right column: lines of curvature make a quadrangulation of the
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Lines of curvature make a quadrangulation of the domain.jpg
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