Hello Javad, Here attached is a version of the geometry file you sent me some time ago, with some comments. It's not perfect, but it works quite well. My best, -- Christophe Geuzaine Tel: 32 (0) 4 366 37 10 http://geuz.org Fax: 32 (0) 4 366 29 10 mailto:Christophe.Geuzaine at ulg.ac.be