Constraints on the multiplicity of the most massive stars known: R136 a1, a2, a3, and c

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Fig. 6

Relative RVs measured for the four diagnostic spectral features in the spectra (when available; see the legend). The first RV is always calibrated to zero. Only component с, which satisfles the criteria in Eqs. (1) and (2), is classified as a binary.

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