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

#       sub topics:
SUB     syncroots.hlp

# format described in ../help.readme


TITLE		SET ROOT MODE

OCCURRENCE	ARB main window and ARB_PARSIMONY: <S.ROOT> button in the left column
                F8 on keyboard

DESCRIPTION	The 'SET ROOT MODE' allows to position the root of the displayed
		tree to any of the edges.

		Click on the <S.ROOT> button to activate the 'SET ROOT MODE'.

		Set the root:

			Move the cursor to any position along the desired edge
			and click on the left mouse button.

                Use the right mouse button to search an optimal root, minimizing the
                distance to the farthest leaf on each side of the root.

NOTES		Short descriptions of the 'MODE' and the functions assigned
		to the mouse buttons are given in the fourth line of the
		ARB main window.

		The root is always placed to the middle of the edge.

EXAMPLES	None

WARNINGS	Be aware that changing the position of the trees root does affect the
                orientation of taxonomic groups.
                For details refer to LINK{keeled_groups.hlp}.

BUGS		No bugs known
