Fig. 3.
Distribution of radial velocities of all 142 observed stars (in grey). The distribution of the GIRAFFE radial velocity members is shown in blue and that of the UVES radial velocity members in red. The patterned bars show the distribution of radial velocities of Galactic stars in the direction of Pismis 18 according to the Besançon star count model for the Galaxy. For the normalization of this curve see text.
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