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Fig. 9

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Rotation in the inner and outer regions of NGC 1904. The plotted values represent the difference between the average radial velocity of stars in a 180 degree sector and the systemic velocity of the whole cluster. The maximum rotational velocity in km s-1 is derived from the best sinusoidal fit of the data. The position angle (in degrees from North toward East) of the rotation axis is also shown.

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