Question: Assign a range to a fitting variable

Hello everyone

I'm trying to do a fit for some points using a model function. However, I don't want to use the full range of the independent variable in the model function because I know there will be no fit then. How to assign a range for the fitting variable?

In the case my writing is not clear, here is what I mean:




I can't do that, only thing I can do is specify the range of the parameters.

Thanks for your help

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