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Acknowledgments

We are grateful for useful discussions with J.R. Banavar, A. Sangani, J. Koplik, S. Kostek, L.M. Schwartz, D.L. Johnson, and A.H. Thompson. The authors would also like to thank D.P. Bentz and W.C. Carter for their assistance in generating the gray-scale images presented in this paper, and P.M. Duxbury for supplying a 2D electrical conjugate-gradient relaxation routine.