Left panel: correlation between γ and the BISSPAN for Alpha Centauri B. The strong correlation suggests these two parameters are similarly measuring the asymmetry. Top right panel: RVs as functions of Julian Day for Alpha Centauri B in 2010. The RVs are estimated using the mean of a Normal fitted to the CCF (red triangles), or the mean (black circles) or median (cyan pluses) of a SN density fitted to the CCF. Bottom right panel: differences between the RVs estimated with the Normal density and those from the SN density.