Never accept a fit blindly. You must check its mathematical and physical validity. The Chi-Squared ( χ2chi squared χ2chi squared value represents the overall goodness of fit. : χ2chi squared is in the range of 10-410 to the negative 4 power 10-510 to the negative 5 power Acceptable Fit : 10-310 to the negative 3 power Poor Fit : 10-210 to the negative 2 power
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or higher, your model is likely incorrect or your initial guesses were too far off. Relative Error Per Element Never accept a fit blindly