Number density of GES cluster targets in open clusters NGC 2516, NGC 2547 and NGC 2264 as a function of RV. the upper (red) histograms show all potential members with S/N> 5. The lower (blue) histograms show the number of faster rotators (v sin i> 5 km s-1) and the solid (green) histograms show stars identified as cluster members with measured rotation periods (see Sect. 3.1). The black curve shows the probability density fit to the measured data comprising of the sum of two quasi-Gaussian distributions; the first, a narrower distribution, represents cluster members, and a second much broader distribution represents non-members.
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