The peak shapes are defined by a series of procedure files called peak Classes. This is to make the addition of new peak shapes a straight forward procedure. You need only to determine the class for your peak shape, incorporate the code in the appropriate peak class procedure file, modify a few lines in list functions in the same procedure file, and your peak shape will appear correctly on the control panel for peak fitting. Each class has a different letter. Each letter designates a different way in which peak parameters are handled.
Reference peaks are in a class by themselves.
This information is provided in the Peak Fit Peak Functions procedure file. All singlet peaks within the Class use the parameters described below. All doublet peaks within the Class use ONLY three additional parameters for the second peak, relative height, relative half-width, and offset. You cannot currently define a doublet in the same class as a singlet such that the second peak in the doublet has more than these three parameters. All singlet Class A peak shapes have only three parameters, height, half-width, and position.