Multi-Peaks fitting

This kind of fitting allows to fit your data points to a sum of Gauss, GaussAmp, Lorentz, PsdVoigt1 or PsdVoigt2 functions.

The first step is to specify the number of peaks. Then you must choose the position of each peak on the curve. This is done by clicking on the plot curve and validating your choice for each peak with the ENTER key.

When the selection step ends, a new dialog pops-up. It displays a table that summarizes the positions and the profiles of the peaks. The Position column shows the indices of the peak points on the data curve, while the X and Y columns display the actual coordinates of the peaks. It is possible to fine-tune the position of each peak before performing the fit.

In the Pro edition of QtiPlot the selection list boxes from the Profiles column can be used to customize the profile of each peak, in order to perform a multi-peak fit with mixed peak profiles. These list boxes are disabled in the student edition.

The Line style button can be used to customize the appearance of the peak line markers.

This dialog lets you choose if you perform the fit using the parameters selected in the table or if you want to open the Fit Wizard and refine the initial guesses before performing the fit.