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Schematic drawing showing the inclination angle Ω and the intercept Tz of the interfacial plane S. Q is the intersection point of the helix axis z with the interfacial plane S. As shown in the figure, Ω is the angle between the helix axis Z and its projection on the plane S, whereas Tz is the distance from the projection of the frst Cα on the helix axis to Q (Hartshorne, 1997).
