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Fig. 1

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Blue line: observed radial velocity distribution for a single epoch drawn from the multi-epoch radial velocity dataset of R136 (Hénault-Brunet et al. 2012a; Sana et al. 2013, see Sect. 4.1 for details). Red dashed line: best-fit radial velocity distribution, including the effect of the orbital motions of spectroscopic binaries. Green line: intrinsic velocity distribution of the cluster, corrected for the orbital motions of binaries. This intrinsic distribution is assumed to be a Gaussian whose width and mean have been optimized to fit the data (see Sect. 2.1).

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