This article has an erratum: [https://doi.org/10.1051/0004-6361/201525666e]
Left panel: highest RV shift between individual spectra plotted against time difference between the corresponding observing epochs. The filled red diamonds mark sdB binaries with known orbital parameters (Kupfer et al. 2015), while the filled black circles mark the rest of the hydrogen-rich sdB sample of RV variable stars. Right panel: same plot for the hydrogen-rich sdOB and sdO sample of RV variable stars.
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