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matlab - incorrect calculation of magnitude signal strength

My question is related to the Spectrum Analyzer block in Simulink. The output with a window (Hann et al.) And without a window (rectangle) is almost the same. The window should contribute attenuation to the maximum amplitude value. But after changing the Window parameter in 'Window options', the changes are not significant. Why are windows not fading in? Or do you have some kind of coefficient by which the amplitude is multiplied so that the values ??with and without a window are close?

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question from:https://stackoverflow.com/questions/65944607/incorrect-calculation-of-magnitude-signal-strength

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