Profile Extraction-Define Positions
This step defines at which positions the sections will be computed.
- Define positions: - with Regular option to define regularly spaced positions along the axis: d efine the step and the range. 
- with List of values option to define specific positions using a list of distances (or clicked points). 
 
- Add them to the project using the Insert button. 
- Optionally repeat, for instance to define more positions on a segment the axis. 
- In case of error, remove all positions using the Reset button or singular positions using the red cross in the list.