how to fit the data properly to custom eqaution?

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sandeep
sandeep el 23 de Ag. de 2022
Editada: Torsten el 23 de Ag. de 2022
I am trying to fit the data with the custom eqaution, however the line is not starting from below 1, is it because the 3rd term has no x value in the equation? how can i fit this line with data properly, any thoughts on this?

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Torsten
Torsten el 23 de Ag. de 2022
Editada: Torsten el 23 de Ag. de 2022
If you want your model curve start at (0,1), delete the constant term k3/3500*3502.
Your experimental curve looks more like an exponential (exp(k1*Cyclenumber)) than a quadratic in my opinion.

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