The 'LINE MODE' allows you to gradually change the line width
of the edges of the displayed tree individually.
Click on the 'WIDTH' button of the 'ARB_NT' window or press the
'F8' key on the keyboard to activate the 'LINE MODE'. In
the latter case, the cursor has to be placed within the
tree display area.
Change line width:
Move the cursor to the desired edge of the displayed
tree and gradually increase or decrease the line width
by repeatedly clicking on the left or right mouse
button.
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