Variable to colorize labels, will be converted into factor
ex
The fraction of the plot height by which segments go up and
down from the tips; by default, it is half of the 'hang'
lwd
Line width of segments
horiz
Plot on a horizontal tree?
hang
The fraction of the plot height by which labels should hang
below the rest of the plot; by default, it is equal to the default
'hang' from hclust which is 0.1