Comparison of the 2010 RVs of α Cen B as derived when using all the spectral line (in black), when using lines for which the correlation between their RVs and the RV of all the lines is strong (in red) and when using lines for which the correlation is weak (in blue). The blue and red selections of lines can be see in Fig. 6. We highlight as well, in the title of each subplot, the number of lines used in each selection, and by how much those lines contribute to the RVs derived using all the spectral lines available. We clearly see that by selecting lines that are strongly correlated or not with the activity signal, we are able to boost the activity signal seen in the RVs by a factor of 2, or mitigate it by a factor of 1.6.
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