Variability of the Balmer lines at the hourly timescale. The color of the points represents the component (blue for wings and green for core) or the full line (brown). Error bars represent the spread of the variability (weighted by significance), i.e., the brown crosses in Fig. 9. The shaded region corresponds to lines where the detection is compatible with contamination from the host binary. The hourly timescale variability seems to increase with the order of the transition. The wing component has a much higher variability amplitude than the green component.