+
+ <li>Optionally specify <b>Scale Factors</b>. Each scale factor in
+ the list is applied to nodes of a corresponding extrusion step
+ unless <b>Linear Variation of Scale Factors</b> is checked, is
+ which case the scale factors are spread over all extrusion steps.</li>
+ <ul>
+ <li><b>Scaling Center</b> can be defined either using spin boxes
+ or by picking a node in the Viewer or by picking a geometrical
+ vertex in the Object Browser.</li>
+ <li>\b Add button adds a scale factor to the list.
+ \image html add.png
+ <center><em>"Add" button</em></center>
+ </li>
+ <li>\b Remove button removes selected scale factors from the list.
+ \image html remove.png
+ <center><em>"Remove" button</em></center>
+ </li>
+ </ul>
+