In this zone one selects, in the graphic part of the assembly, a summit which will be taken into account for the calculation and the creation of the required curve, the splines are positioned at the top of the tree of creation. Several summits can be selected in order to generate as much curve than necessary.

To remove a summit it is enough to select it and press on the key ''Suppr'' of the keyboard. You can also make a right click in the zone and choose to remove all the summits or only the selected summit.

Curve obtained with selection 1 summit: