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Fig. 4
Top: RVc as a function of the MJD in the case of the FeII 5234.625 Å spectral line, and amplitude of the RVc curves as a function of the spectral line depth (D) for AI Vel. Typical error bars are indicated in the upper right of each panel. Bottom: the same for β Cas f the FeII 4508.288 Å spectral line.
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