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Fig. 6


Time series of the Bz values obtained for β CMa (top panels) and ϵ CMa (bottom panels) using a line mask that includes (left panels) or excludes (right panels) helium lines. The black asterisks show the Bz values derived from the observations carried out in December 2013. The red rhombs show the Bz values obtained from each consecutive observation carried out in April 2014. The blue triangles indicate the Bz value extracted from the average LSD profiles obtained on 21 April 2014. The green dot on the left side of the top left panel shows the Bz value obtained by Silvester et al. (2009, S09) from the ESPaDOnS observation of β CMa carried out in 2008.

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