GLS periodograms of α Cen B derived from the original time series (solid black line), (dashed red line), and (dash-dotted blue line), focusing on a subset of the epochs including the rotation period of the star equal to 39 days (highlighted by the vertical gray line). The 39-day peaks have normalized powers and P_oc = 0.167 in the original and in the oc-corrected GLS, respectively. The normalized power of this peak is reduced at P_bp = 0.027 for the bp-corrected GLS. The cv value for is displayed as the horizontal blue line and is equal to 0.022; we recall that the cv for is 0.43.