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To my knowledge, peaks in Lomb-Scargle periodogram does not preserve the amplitude of the original data. It just shows how much variance each frequency explain about the original data.

For example:

enter image description here

The peak of Lomb-Scargle periodogram = 11, is no where close to the amplitude of the original data, which definitely has amplitude smaller than 3.

Is there any way that I can preserve amplitude of the original data with Lomb-Scargle periodogram?

My data is unevenly sampled, so I can't use Fast Fourier Transform

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