Change of line position of emissions and absorptions, converted to Doppler shifts, of the Fe II line before and after a 3% emission at t = 0. The graph shows ten time steps (±80 s) before and after the emission event (indicated by a vertical red line). The mean positions for all 799 emission events are displayed. The plus signs correspond to the emission profiles and the line positions of the absorptions are shown as blue diamonds. At t = 0 s and 8 s, there are no absorption profiles from which line positions could be derived.