Displacement of the tube axis as a function of position along the twisted tube. The continuous line corresponds to the displacement in the x-direction while the dashed line represents the displacement in the y-direction. The dotted line is the purely sinusoidal displacement in the x-direction for the untwisted case. In this example, kT = −0.75k, ϕ0 = 0, where ξ0/L = 1.
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