<b>Double nodes</b> selects a node coincident with other nodes
(within a given <b>Tolerance</b>).
See also \ref tui_double_nodes_control "Double Nodes quality control".
+</li><li>
+<b>Connectivity number</b> selects nodes with a number of connected
+elements, which is more, less or equal to the predefined <b>Threshold
+ Value</b>. Elements of the highest dimension are countered only.
</li>
</ul>