Please go to the Expert fitting mode Recover the ``Expert-1'' example. This example refers to the fit of eq. 3 but with the following assumption: if the value of the first column is less than 0.1 then it is assumed that it refers to a value of frequency, , and the data set was obtained for a given value of ; if the value of the first column is larger that 0.1 then if refers to a value of mass and the data set was obtained for a fixed frequency . The plots must therefore be different. Please check the different menus and discover the differences with respect to the previous example.
PUsers can take full advantage of this fitting mode since they can program elaborated functions where the data sets can be codded in such a a way that a n-dimensions fit can be performed.