V band photometry corrected from extinction (panel a)). SMARTS data are shown as squares, Palermo data as stars, and Maidanak data as triangles. Photospheric radial velocities (panel b)), veiling (panel c)), and He i (5876 Å) radial velocity (panel d)) phase variations. In panels b)–d), filled symbols are from HARPS data and open ones from ESPaDOnS. The error bars are shown for each observation in panel a), and are smaller than the symbol sizes in panel b). We show in panels c and d only the mean error bars to avoid crowding the figures. Different colors represent different rotational cycles identified as the integer part of the observational phase in Table 1: black – cycle 0, green – cycle 1, red – cycle 2, aqua – cycle 3, dark blue – cycle 4, pink – cycle 5.