#       main topics:
UP      arb.hlp
UP      glossary.hlp
UP      mode.hlp

#       sub topics:
SUB     rst_log_zoom.hlp

# format described in ../help.readme


TITLE		LOGICAL ZOOM MODE

OCCURRENCE	ARB_NT and ARB_PARSIMONY: <LZoom> button in the left column
		F5 on the keyboard

DESCRIPTION	The 'LOGICAL ZOOM MODE' allows you to display subtrees within
		the tree display area of the 'ARB_NT' window.

		Click on the <LZoom> button of the 'ARB_NT' window or press the
			'F5' key on the keyboard to activate the 'LOGICAL ZOOM
			MODE'. In the latter case, the cursor has to be placed
			within the tree display area.

		Display a subtree:

			Move the cursor to that internal node of the displayed
			tree (section) which defines the subtree and click on
			the left mouse button. The subtree-defining node is that
			located closest to the indicated root (open square)
			of the whole tree which directly or indirectly connects
			all branches of the subtree.



NOTES		To reset the display to show the whole tree either
                - choose the 'Logical Zoom' item from the 'Tree/Reset zoom' menu or
                - left-click somewhere outside the tree or
                - press the key '0' (zero) in the tree display.

EXAMPLES	None

WARNINGS	None

BUGS		No bugs known