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Table 1 Table 1

From: Simultaneous Generation of Multiple Three-Dimensional Tractor Curve Beams

Type of curve x0(t) y0(t)
Ring curve Rcos(t) Rsin(t)
Archimedean spiral − Rtcos(10t) − Rtsin(10t)
Trefoil-knotted curve Rcos(t) − 2Rcos(2t) Rsin(t) + 2Rsin(2t)
Square curve − 2Rcos(t) + 0.3Rcos(kt) − 2Rsin(t) + 0.3Rsin(kt)