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Fig. 2.

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Difference between the mean radial velocities of the stars located on each side of the cluster with respect to a line passing through the center as a function of PA (measured from north, PA = 0°, to east, PA = 90°, with a step of 18°, clockwise system) for the globular cluster NGC 5139. The orange dashed line is the sine function that best fits the observed patterns (blue dots).

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