Fig. A.1
Variations of the radial velocity (RV, upper graph), S-index (middle graph) and longitudinal magnetic field (Bl, lower graph) of 77 Tau between 31 December 2007 and 14 January 2011, as observed with Narval and ESPaDOnS. Error bars of 30 m/s and 0.05 are illustrated for RV and S-index respectively. As to the Bl plot, error bars are those of Table 1.
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