- The
*Basic*mode is directed to those who want to perform a 1D fit of a function where is the dependent variable, is the independent variable and are the fitting parameters. A plot is produced according to the user settings. - The
*Advanced*mode makes possible to fit 2D functions in the form of where is the dependent variable, is the independent variable, is the independent variable, and are the fitting parameters. For each value of a three columns' table has to be introduced and a plot is produced according to the user settings. - The
*Expert*mode gives to possibility to fit function of the type

where is the dependent variable, is the independent variable, is the independent variable, and are the fitting parameters. Three columns' tables for values and/or for values can be included and both and plots are produced according to the user settings. Please note that PUsers can take full advantage of this fitting mode.