Quoth Henning Thielemann : ... | Will you make that plotter wrapper public? Why not - I don't expect it's going to be big news in the computing world, but it's easy to set the files up. See http://staff.washington.edu/donn/ezp/hsezp.html Thanks to Bulat for the tip on multi-parameter typeclass. Donn Cave, donn@drizzle.com