The Symmetry Bar
The Symmetry Bar (below the Main Tool Bar) allows the user to remove
wires from certain planes and regions. A depressed button indicates
that the wires associated with the specified region (plane) have been removed (note that the major elements are NOT removed — the removed wires can thus be ``reintroduced'' if required). In order to specify a conducting surface lying orthogonal to a plane of symmetry or to the ground plane, the user must specify an element with at least one side lying completely in that plane. The symmetry bar allows the user to
remove that wire without removing the element or having to manually
construct the mesh of wires.