Dear User of Geometry Center Software: We would like to find out how you are using our software. Think of Geometry Center software as a new kind of shareware: you share your science and successes with us, and we share our software and support with you. If you use Geometry Center software, please send us a note telling us what you are doing with it. We need to know: (1) What you are working on - an abstract of your work would be fine. (2) What Geometry Center software you use. (3) How that software has helped you, for example, by increasing your productivity or allowing you to do things you could not do before. In particular, if you feel that Geometry Center software has had a direct bearing on your work, please tell us about this. We encourage you to cite the use of any Geometry Center software you have used in your publications. To cite Qhull, use Barber, C.B., Dobkin, D.P., and Huhdanpaa, H.T., "The Quickhull algorithm for convex hulls," ACM Trans. on Mathematical Software, Dec 1996. http://www.geom.umn.edu/software/qhull Please send e-mail to qhull@geom.umn.edu Thank you!