dual edge color

Aug 14 at 5:29 PM
is it possible to assign a dual edge colour (like the chord diagram in site below), not necessarily using the nodexl functions or autofill, but with a custom edge function? I have been to the graph gallery but could not find guidance there. can anyone help please. thanks

![Image] http://bl.ocks.org/nbremer/864b11eb83aac3a1f6a2.