How do I process power spectral density?

I am processing the TEC (Total Ionospheric Content) from the GPS (time domain, figure 1), and I want to change it to what it looks like in figure 2. Can you help me to solve it?
Capture.JPG

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この質問は閉じられています。

質問済み:

2019 年 5 月 14 日

閉鎖済み:

2021 年 8 月 20 日

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