Fig. 8
Radial velocities of the He ii λ 4686 emission line as measured on our June 2013 optical spectra of Cyg OB2 #5. The S-wave relation from Rauw et al. (1999) is shown by the dashed line. No systematic shift is found between the data and the curve, while the s = 0 orbital solution of Kennedy et al. (2010) predicts a shift of about 35 km s-1 toward negative values.
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