Total variability in Obs. 3814 in terms of as a function of the binning time step; in other words, the figure effectively shows integrated frequency power. The sulphur (blue, 5–5.35 Å) and silicon (red, 6.6–7.2 Å) line regions are compared to a reference band (black, 5.4–6.6 Å, excluding a region of ±0.05 Å around the Sixiv line), with the ratio shown in the bottom panel. is normalised to its value at 500 s in each respective band. The light grey band indicates a range where systematic effects due to the dither of the telescope would arise, if they were present.