Fig. 4

Left panel: detrended one-day binned mean radial velocity RVm of α Cen Bmeasured on all the spectral lines. Uncertainties are displayed, but are too small to be visible. Middle panel: detrended one-day binned individual radial velocity RVi of the Fe I line at 4112.30 Å. Right panel: weighted linear regression between RVi and RVm (red line). The coefficient
as well asthe correlation slope are indicated in the legend. The peak-to-peak variation due to activity is ~10 m s−1 in the RVm and ~30 m s−1 in the RVi of the Fe I line at 4112.32 Å.
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