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  • $\begingroup$ Thanks, that works. But the combined line seems slightly thicker than the others, do you know how to deal with that? $\endgroup$ Commented Apr 20, 2013 at 19:23
  • $\begingroup$ @user0501 Unfortunately no. I'd have to search the docs more for that and right now I do not have the time. Also, ideally there should be a solution for Graph objects, not just GraphPlot. My answer is by no means complete. $\endgroup$ Commented Apr 20, 2013 at 19:35
  • $\begingroup$ @user0501 I'm trying to do the same thing with LayeredGraphPlot with little success, so I might try Szabolcs solution. However, from your comment, to deal with the thicker double arrow, could you add something in such that if a rule and its inverse are both found, to reduce the thickness of each resulting edge by 50%? $\endgroup$ Commented Jun 12, 2015 at 19:47