[Plugin: Easy Chart Builder for WordPress] Group Separators?

On charts with many groups (15) is there any way to have a separator or some way to better distinguish between values that are associated with a particular group? In the example below, it is hard to know which name is associated with which bar.

http://www.squamishspeaks.ca/chart/

[easychart type=”horizbar” height=”600″ width=”550″ title=”Council Candidate ‘Likes'” groupnames=”Wk 1, Wk 2, Wk 3, Wk 4, Wk 5, Wk 6, Wk 7″ valuenames=”Eric Anderson, Phil Audet, Balwinder Biring, Susan Chapelle, Nate Dolha, Uffe Hansen, Patricia Heintzman, Brad Hodge, Peter Kent, Douglas Neville, Ted Prior, Brian Raiser, Doug Race, Ron Sander, Rob Weys” group1values=”0,0,0,71,9,0,14,30,14,0,20,0,7,37,0″ group2values=”0,0,0,0,0,0,0,0,0,0,0,0,0,0,0″ group3values=”0,0,0,0,0,0,0,0,0,0,0,0,0,0,0″ group4values=”0,0,0,0,0,0,0,0,0,0,0,0,0,0,0″ group5values=”0,0,0,0,0,0,0,0,0,0,0,0,0,0,0″ group6values=”0,0,0,0,0,0,0,0,0,0,0,0,0,0,0″ group7values=”0,0,0,0,0,0,0,0,0,0,0,0,0,0,0″]

http://wordpress.org/extend/plugins/easy-chart-builder/