nodes. This check-box is enabled provided that the selected mesh
includes quadratic elements.</li>
<li><b>Exclude Groups</b> group box allows to ignore the nodes which
-belong to the specified mesh groups.
+belong to the specified mesh groups.</li>
+<li><b>Nodes to keep</b> group box allows to specify nodes to keep in
+ the mesh. (By default a node being the first in a group of
+ coincident nodes is kept.) It is possible to either select nodes in
+ the Viewer or select groups of any element type whose nodes will be
+ kept.
+ <ol>
+ <li>\a Selection button activates selection of nodes to keep.</li>
+ <li><b>Node IDs</b> button activates selection of nodes in the
+ Viewer.</li>
+ <li><b>Groups and Sub-meshes</b> button activates selection of
+ groups and sub-meshes.</li>
+ <li>\b Add button adds selected nodes or groups to the list.</li>
+ <li> Nodes or groups selected in the list can be removed using \b
+ Remove button.</li>
+ </ol>
+</li>
</ul>
<li><b>Automatic mode:</b>
<li>To confirm your choice click \b Apply or <b>Apply and Close</b> button.</li>
</ol>
-\image html merging_nodes1.png "The initial object"
+\image html merging_nodes1.png "The initial object"
-\image html merging_nodes2.png "The object has been merged with a very big tolerance"
+\image html merging_nodes2.png "The object has been merged"
<br><b>See Also</b> a sample TUI Script of a
\ref tui_merging_nodes "Merge Nodes" operation.
