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    $\begingroup$ Running your code as is I get "Failed to converge to the requested accuracy or precision within 100 iterations" for both FindFit and NonlinearModelFit (Mathematica 10.4.1, Windows 10). I suspect you'll need to do some scaling of your data to get convergence. $\endgroup$ Commented Jun 14, 2016 at 17:28
  • $\begingroup$ @Jim I don't think that message matters very much. I get a good fit from FindFit, and NonlinearModelFit seems to find the same parameters, but not return all properties. $\endgroup$ Commented Jun 15, 2016 at 8:15