Profiles of the 4428 Å feature in Tc 1 (red) and in the comparison star HR 6334 (blue). The black and green profiles of the 4428 Å feature have been constructed by avoiding the stellar emission and absorption lines (marked by short black lines) and by fitting a high-degree polynomial function to the clearer regions. The minimum of the 4428 Å feature in HR 6334 occurs around 0.0 km s^-1, while it seems to be blue-shifted in Tc 1. At the top, the profiles of Tc 1 has been shifted by 126 km s^-1 redwards and superposed on the HR 6334 profile to illustrate the apparent non-coincidence of the minima of the profiles in both stars.