The Metric programs were developed in the Applied Analysis & Mathematical Physics Group and the Integrated Optical MicroSystems Group, MESA+ Institute for Nanotechnology, University of Twente, Enschede, The Netherlands. Comments and bug reports are welcome, please contact Manfred Hammer University of Twente Faculty of Electrical Engineering, Mathematics, and Computer Science, P.O. Box 217 7500 AE Enschede The Netherlands Phone: +31/53/489-3448 Fax: +31/53/489-3996 m.hammer@ewi.utwente.nl www.ewi.utwente.nl/~hammerm/