Fig. 2
Bisector span (BIS) as a function of RV (top), and as a function of the RV residuals (bottom). Uncertainties in the BIS are assumed to be twice the RV ones. In both panels the scale is the same in the x and y axes. No correlation is seen between BIS and RV residuals. The extra uncertainty seen in the RV data is unlikely to be caused by stellar activity.
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