Each time a graph window is opened, two more entries appear in the main menu: graph and mathematics
This menu allows you to apply several kinds of mathematic operations to the diagram.
Below you find some selected examples from the mathematics-menu.
If for example you apply 'Mean/Min/Max for...' the x-Axis, these values appear as two different-coloured dots and a vertical line within the diagram and also appear in the 'Notes' section to the right of the graph-window.(see graphic below)
After selecting the menu-item 'Linear Regression y=a+xb' a line of best fit is displayed as in the graphic below. (red coloured line)