Fit to the Stokes V LSD time series corresponding to the ZDI map of figure B.1. Synthetic profiles corresponding to our magnetic models (dashed lines) are superimposed on the observed LSD profiles (solid lines). The fractional rotational phases of each observation are also mentioned at right-hand side of each profile. The successive profiles are shifted vertically for clarity purposes, and the associated reference levels (V = 0) are plotted as dotted lines.