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?
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이 질문은 마감되었습니다.

질문:

2019년 5월 14일

마감:

2021년 8월 20일

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