+\anchor reversed_edges_helper_anchor
+<h2>Reversed Edges Helper</h2>
+
+\image html rev_edges_helper_dlg.png
+
+\b Helper group assists you in defining <b>Reversed Edges</b>
+parameter of the hypotheses depending on edge direction.
+
+<b>Show whole geometry</b> check-box lets you see the whole
+geometrical model in the 3D Viewer. This can help you to understand
+location within the model of a set of edges shown in the Viewer.
+
+<b>Propagation chains</b> group helps you to define
+<b>Reversed Edges</b> so that opposite edges of quadrilateral faces
+will be split in the logically same direction. When this group is
+activated, the list is filled with propagation chains found within the
+model. When you select a chain in the list, edges of the chain are
+shown in the Viewer with arrows so that you can chose a common
+direction for all chain edges. \b Reverse button inverses the common
+direction of chain edges. If \b Add button is active, this means that some
+edges of a chain have different direction and you can click \b Add
+button to add such edges to <b>Reversed Edges</b> list.
+
+\image html propagation_chain.png "The whole geometry and a propagation chain"
+