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    $\begingroup$ It's because you set Opacity[0], so the line is completely invisible. To disable filling, use FaceForm[None] instead. $\endgroup$ Commented Dec 5, 2015 at 20:42
  • $\begingroup$ @Rahul Thanks for the help. I learned a lot with the new FaceForm[None] command. $\endgroup$ Commented Dec 5, 2015 at 21:35