Fig. 4

DSAR plot. The 1-day data are shown as black dots. We also smoothed the 1-day data with a Hendrick Prescott filter, which prevents temporal aliasing (blue line (parameter = 1000) and orange (parameter = 10⁸) lines). Note that the y-scales are different. See Fig. 4 for the description of the vertical lines corresponding to key time periods. Each tick on the x-axis corresponds to 1 January of each year