Fig. 3
Distribution of velocity uncertainties derived from the comparison of repeated velocities measurements of the same target. The peak of the distribution is at ~0.4 and ~0.2 km s-1 in NGC 1841 and 1904, respectively. This difference is due to targets in NGC 1904 being on average 0.4 mag brighter than those in NGC 1851. The dashed vertical line is the adopted threshold for rejecting objects.
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