Hi Daniel, Mathematica has very strong curve fitting capabilities. The straight line in the Log-Log plot implies Log y = m Log x+b is a reasonable model. Which can be written as y = b x^m. The attached notebook uses NonlinearModelFit to fit that model to the data.
If you like Mathematica, you should note that there are home and student licenses at very reasonable prices, with of course a non-professional use provision.. (No -- I don't work for Wolfram, but I love Mathematica.)
Kind regards,
David
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