+ * Each of optional **Scale factors** in the list is applied to nodes of a corresponding extrusion step unless **Linear variation of factors** is checked, is which case the scale factors are spread over all extrusion steps. **Base point** serves as a scaling canter.
+ * *"Add"* button |add| adds a scale factor to the list.
+ * *"Remove"* button |rem| removes selected scale factors from the list.