Interesting, but I think the authors could have learned more from Edward Tufte (who is, of course, cited in their paper).

Their use of symbology is awful. I applaud the effort and I think it's a good start, but given smart guys who so obviously *read* the literature and know about these systems, I'm kind of astonished that the result doesn't really conform to best practices.

Or at least, best practices as I see them (and I readily admit to being a Tufte superfan).