Thank you for your answer. For fiting peaks for original PSD, do you have some suggestions? Is there a function in brainform that can do this? I am trying to restore the model fit based on periodic and aperiodic parameters and determine the amplitude of uncorrected PSD based on the center frequency. Is it feasible? I referred to the content in this FOOOF model, and PSD units - #6 by emokh1986 on how to restore model_fit. It seems that the equation is like this:

amp1、cf1、std1 refer to periodic parameters. Is this correct?
best wishes,
sguo