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Profile curve in the (x, z)—plane, where z(s) represents the height and ρ(s) the radius of the shape profile at the given value of the arc length s. Ls stands for the total length of the shape profile, u is the angle of rotation about the z—axis and θ(s) represents the angle formed by the tangent to the profile curve and the plane that is perpendicular to the axis of rotation ez.
