Fig. 4

LSD Stokes I and V profiles of χ Cyg (in stellar rest frame velocity) from Narval observations collected in Mars 2012 (average of 174 V sequences). Bottom: LSD Stokes I profile (same as Fig. 1). Middle: LSD Stokes V profile obtained when using a numeric mask that only gathers atomic lines with low values of Landé factor (mean value = 0.9). Top: LSD Stokes V profile obtained when using a numeric mask that only gathers atomic lines with high values of Landé factor (mean value = 1.5).
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