Different plot with zoom

I have to fit these dates with a sine. The plot is ok and I obtain a good chi square. But I see this:


This is so strange but when i zoom it for example between 15 and 40 (where the fit is not good according to this picture) I obtain:


that agrees with the chi sqare



your_fit_function->SetNpx(1000); // or even 10000, if you like

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