Short descriptions of the 'MODE' and the functions assigned
to the mouse buttons are given in the fourth line of the
'ARB_NT' window.
The displayed tree topology is exported to the drawing
tool xfig.
The middle mouse button (placed anywhere within the tree
display area) can be used to move the whole tree.
The scale bar and its label can be moved by positioning the
cursor anywhere on the bar, keeping the left mouse button
pressed, moving the cursor to the desired position and sub-
sequently releasing the mouse button. The label of the bar
can be moved independently.
The previous topology can be restored using the 'RESET MODE'
('RESET' button on the 'ARB_NT' window).
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