The sample introduces the Non-linear fitting models.
Select data series on left panel [Points].
Select menu item
The 'Approximation line' Wizard appears.
To find regression line on step 2 select item 'Regression line' and on step 3 set Polynomial degree value '3'.
New graph appears. On step 5 select line color and click
To find nonlinear fit, on step 2 select item 'Non-linear'.
On step 3 select Family 'Peak' and Function 'Edgeworth-Cramer'.
On step 4 click
New graphs appear. See how curve fit conforms your data.
On step 5 select line color and click
Close the dialog and select menu item
to compare the fits.