How can I smooth a power spectrum using parzen window?

Questions
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1

I’ve posted the plot of the original power spectrum, and also uploaded the original data. How can I smooth the spectrum using a Parzen Window with bandwidth of 0.4Hz ?

Thanks for your help.: )

ElCentro.jpg
ElCentro.jpg1253×806 69.4 KB

2

There is an example in ParzenWindow: Parzen window (fourth-order B-spline)—Wolfram Documentation, under Applications.