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. 2020 Jun 10;10:9404. doi: 10.1038/s41598-020-66368-0

Figure 4.

Figure 4

The smoothed red curves shown in Fig. 3 are plotted here on a single graph, for comparison; for each station, the average value of the PSD observed in the time interval of interest is subtracted from the corresponding curve, prior to plotting, as this can change significantly from station to station, but is not relevant to our analysis. Each colour corresponds to one station, as specified. Again, the dates of mentioned governmental decrees are highlighted as in Fig. 2.