Links in the text refer to the lower part of the page

Curve fitting (linear and non-linear)

A number of least squares curve fitting methods
can be selected:

A general (non-linear) Levenberg-Marquardt method to fit your data to any continuous function you define.
Just select data from the grid, define your model function, select the constants in this function for which
you want a least squares fit and push the Go button.

Linear combination of Functions, defined in the Functions window, and Data selected in a Data grid 2. The observed data for which you want a least squares fit are given in Data grid 1.

Fit to a linear combination of Functions and Data sets

Below an example of a fit of an pobserved spectrum to a linear combination
of 2 functions and 2 model spectra.