Illustrator Live Trace produces objects when I really just need a path
Hi Experts
I'm using Illustrator CC.
I am needing to trace many charts like the following so they can be modified in Illustrator.

Usually I strip off the axes and just try to trace the lines.
And often rather than the trace producing paths, it produces more complex objects.; For example one of these lines might really be composed on a path of many rectangles.
How to I force the Live Trace to only produce a single path for these kinds of charts?
Thanks!
