Reduce the spectrum noise of plomb function

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zein on 19 Feb 2020
i have pressure data with non-uniform spaced time sample as show below x-axis is the time in second and y-axis is the pressure values
as the i have non-uniform spaced time samples, i used plomb funnction to get power density spectra
I got this resutls
is there any way to use DFT averaging using windowed segments as in Pwelch function to reduces the variance σ2 of the noise spectrum ?

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