Mean (top panel) and variance (bottom panel) of a one-year subseries slided every eighth of a year of the energy supply rate computed from the combined time series of the modes. These quantities are plotted against the central date of the considered subseries and the x-axis error bars show the range of dates taken for each subseries. Periods of low (pink) and high (brown) magnetic activity are reported from Table 2 and $\overline{F_{10.7}}$ is reported in red, in the bottom panel, for comparison.