Comparison of FIES spectra of four epochs over 4 months at the end of 2021 showing three spectral lines: Si IIλ6347 Sc IIλ6604 and [Ca II] λ7324. Si II is a strong absorption line and its radial velocity changes with an amplitude of 16 km s⁻¹ over 4 months, while [Ca II] is a double-peaked emission line that shows barely any changes at the same epochs. The behaviour of Sc II shows similarities to both of these lines – the position of its emission wings is similar to [Ca II], but the central absorption shows variability similar to Si II in both its radial velocity and depth. The grey vertical line marks v_sys.