Fig. 6. Pro(cid:12)les of the H (cid:11) line during four time intervals. On JD 2451421.5 { solid line, from JD 2452787.5 to JD 2452826.5 { dotted line, from JD 2452873.5 to JD 24523051.2 { dashed line and from JD 2453122.6 to JD 2453211.5 { dash-dotted line. The positions of Ti I line at 655.608 nm and Fe I line at 656.922 nm, and the H (cid:11) position with the radial velocity determined by these two lines, are