In OriginPro, the Peak Analyzer is capable of performing non-linear curve fitting to the peaks with built-in or user-defined functions. Available built-in functions include:
- Gaussian
- GassAmp
- Bigaussian
- GaussMod
- GCAS
- ESC
- CCE
- Lorentz
- LogNormal
- Voigt
- PsdVoigt1
- PsdVoigt2
- PearsonVII
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- Asym2Sig
- Weibull3
- InvsPoly
- Sine
- SineSqr
- SineDamp
- Pulse
- FrqserSuzuki
- DoniachSunjic
- Gaussian_LorenCross
- ConsGaussian
- HVL
- BWF
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Peaks in a dataset may sometimes be described by different functions. For instance, the first peak might be Gaussian while the second is Lorentzian. With the Peak Analyzer, you can fit data using a different function for each peak.

When the fitting is done, a peak report can be generated. In addition to the fitting statistics results such as Degree of Freedom and Reduced Chi-Sqr, the characteristics of each peak are also summarized in the report. Below is a sample peak report:

The fitted values and standard errors of the parameters are output to the fit peak report:

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