CFTool fitting - same data different fittings

I'm using the CFTool and a custom equation to fit my data. The equation I use is : a + b/(x^(n-1)). Using the same data and equations I'm getting different fit each time which apparently some of these fits are not accurate. I have to try several times until I get the best fit. I attached three fits. Is there any way to solve this?

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2014-3-18

编辑:

2014-3-18

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