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lets explain in short what the model surgery does therefore we zoom into one of the peaks lets say from 800 to 825 Hertz switch the view to histogram to see the line resolution if you want a more precise result its not possible to endlessly increase the number of FFT lines since the hammer impact is quite short therefore the iterative sacrified method is used it plots real and imaginary part of the FFT lines around the centre peak in the complex coordinate system to determine exact frequency and damping factor