How can I improve the attached code to reduce the gap between fitted curve and the original ones?

Hello friends

I have a code that I want to know the amplitude of Vabc between t=0.1 and 0.2

But the fitted curve is a bit different from the original ones.

Can you advise?

[Mathieu NOE]

hi

why the need to do a fit to measure a sine wave amplitude? this seems overkill IMHO

[Atefeh]

Hi Mathieu

I need the amplitude value in order to use in a machine learning process, the output waveform is extracted from a simulink model.

[Mathieu NOE]

hello

why not simply use max / min of your data ?