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The β-sheets studied consist of strands of glycines or alanines. Here, alanines are shown. Oxygen atoms are used to define vertices of triangle elements. Bending of the β-sheet is described by changes in the directions of the normal vectors (curvature). The minimized structure shows the sheet is slightly curved. Two different triangularization schemes, Tri I and Tri II, can be used to describe the curvature change.
