Question: Good curve fitting II

Hi,@Carl Love sorry for my crosspost, I miss click. I try to reply under your response, but it does not show my reply under your response.

Thank you very much, you solve my problem, the method you provided is useful.

But now another formula need to be fit, previously, I use Excel to do the best_answer_optimization, I want to know if Maple could do it. The formula is as follow ,download Excel file I-T.xls,t.txt, i2.txt, t.txt stands for t (right hand side of equation, copy from the column A of excel),  ,i2.txt stands for I (left-hand-side of equation, copy from the column B of excel), where Is, τ (tau in excel) , d(0

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