There are three pushbuttons available, respectively for:
- adding a new line
- deleting a line
- emptying the table
- finding the lenght and difference in height of the single spans (Relative Values
Calculation).
The first two pushbuttons are only active for a certain position of the mouse (on the
column showing the tower number). In the example below, the user clicked the cell relevant
to tower NR.4, therefore, the line addition/deletion pushbutton is enabled.