Variation of the Hβ region in the low-state, post-flare and reverted-state. All lines are smoothed with a median filter with a 5 pixel window, which is much much narrower than any features that could be present. In each panel, a relevant spectrum, shown in orange, is subtracted against SP0, which is acting as the baseline in these plots and shown in blue. Their subtracted result is shown in green. The observed flux is the y-axis and velocity offset is x-axis. We also indicate the 0 value in the y- and x- axes for every panel with vertical and horizontal dashed lines. These visual aids emphasise the non-zero redshift in the emission line excess in Hβ during the post-flare. The statistical significance of the excess is also given in the relevant panels, see footnote 3 for details. We see that the green line in the low-state and reverted-state are consistent with 0, indicating no broad-line variation outside of the flare. This figure is a truncated version of Fig. B.2.