Equivalent width of Y ii lines. The average of seven Y ii lines is plotted for different epochs: CORALIE 2000 (open circles), FEROS 2005−2006 (filled circles), CORALIE 2009 (triangles), HARPSpol 2010 (squares), and CORALIE 2010 (stars). Lower panel: secular variation of the mean equivalent width after removing the rotational modulation.
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