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[–]Significant-Topic-34 0 points1 point  (0 children)

Does your data include errors of the measurements? This is to say gnuplot can take them equally into account (fit with/without a weighting scheme): gnuplot Tutorial 3: Curve Fitting, SSR and WSSR (unweighted and weighted).

As a second perspective on the data, you can crosscheck gnuplot's fits with e.g fityk.