Hi Waltenegus,
you should consider to show us your code and the data you used to fit the
curve. If you can't or if you prefer you can simply show the code and some
sample data on which the code can be run.
You'll find nice and useful tool in nlstools package.
Hope this help
Giuseppe
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Giuseppe Calamita
PhD at CNR-IMAA Italian National Council of Research - Institute of Methodologies for Environmental Analysis, Tito Scalo -Potenza ITALY
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