Question: NonlinearFit

Question:NonlinearFit

altomlinson 68 Maple

Download 7904_P3HT.mws
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I am trying to find parameters using NonlinearFit and keep encountering the following message:

'Warning, limiting number of iterations reached'

I have not been able to figure out how to overcome this warning - the fits I am getting are
 not very good.

Also, I would like to plot two sets of scatterpoints and then the two fit functions assuming I can rectify the previously stated problem.

Above is the *.mws file.

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