Thanks again, I was able to fix it , now my smoothing results are very similar to REW. Using squared magnitudes did not really changed the result. However using a first order polynomial instead of second order one fixed the first issue. The second difference comes from how to generate data...
Thanks a lot for the hint! Currently I am not using squared magnitudes for smoothing. I will give it a try. What is the idea behind using the squared magnitudes?
I have created a tiny command line frequency response display and comparison tool "FreqRespGraph" on github. It can also smooth curves using a Savitzky-Golay filter. However the results look rather different to REW results, which uses a IIR filter based approach:
I need about twice the...
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