The amplitude of the equinoctial pattern as a function of normalised solar wind dynamic pressure. The pattern amplitude is quantified by the standard deviation of the mean values of Δam in the 288 F–UT bins used to construct patterns like those shown in Figure 10, σ(<Δam>_F,UT). Patterns were constructed for 20 quantile ranges of the hourly mean solar wind dynamic pressure p_SW and σ(<Δam>_F,UT) for each is plotted as a function of <p_SW>_q/<p_SW>_all, where <p_SW>_q is the mean dynamic pressure in the quantile range and <p_SW>_all is the mean for all the data (which are for 1995–2017). The grey and white bands define the 20 quantile ranges of p_SW employed. There are a total of 192,719 valid hourly means of p_SW in the dataset and so each of the 20 quantile ranges contains 9636 samples.