I have performed a presentation in a scientifical session in 2005 here. Please find the PPT here: http://viraghagymasz.hu/cikk/Lippay_2005_en.pdf ===================== Hi Gang, Agoston J. wrote about his presentation on the Web. Wow! Nice photos and nice technical information. This is a keeper for the Wiki if the PBS Wiki ever graduates into teaching materials. Cordially, Joe Conroe TX