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wide range of x:

narrow range of x:

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• For POS root: beta=-13.3 gives minimal y.
• If two measured peaks are located below this curve then B*B-C < 0, fit returns limit value of beta or not converging.
• Two solutions for beta -17 and -9 - x and y are the same.
• NEG-ative root gives wrong curvature

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Phi-beta fit results and quality

Data

• exp=cxif5315:run=169
• Distribution of parameters for peaks selected by Meng:

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