Fig. 4.
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Kinematic fit of NGC 1850A. Left panel: projected density distribution of NGC 1850A. The best fit King (1966) model is overplotted. Middle panel: distribution of radial velocities of RSG stars as a function of the distance from the cluster centre. The 3σ boundary predicted by the best fit King (1966) model is overplotted. Right panel: distribution of radial velocities of the same sample as a function of the position angle. The best fit sinusoidal curve is overplotted.
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